Historical Identification: Per Dreyer, NGC 7100 (Bigourdan (list II #90), 1860 RA 21 32 27, NPD 81 44) is "very faint, mottled but not resolved". The first IC notes "Seconds of RA are 41, NPD is 81 45.2 (Spitaler)". The second IC adds "RA 20 32 13, NPD 81 40 (Bigourdan). Query, is Spitaler's object (IC p. 227) a different one?" (answer to Dreyer's query, yes, it is).
Discovery Notes: Spitaler thought he observed NGC 7100, thanks to incorrect NGC positions for that and NGC 7101; but his position falls exactly on the galaxy listed as NGC 7101, so he actually observed that object, and not NGC 7100.

Historical Identification: Per Dreyer, NGC 7101 (= GC 6002, Marth #448, 1860 RA 21 32 41, NPD 81 39) is "faint, very small, round, stellar". The first IC says "Not seen by Spitaler; evidently = 7100" (actually, Spitaler's position for what he thought was NGC 7100 falls exactly on NGC 7101, so he did see NGC 7101, and just didn't know it). Thanks to confusion about Spitaler's observation, many references mistakenly list NGC 7101 as NGC 7100.
Discovery Notes: The notes in the first IC for NGC 7100 and 7101 are the result of an incorrect conclusion by Spitaler as to which object he observed (partly thanks to both NGC positions being wrong). His supposed position for NGC 7100 falls exactly on the galaxy listed above, so there is no doubt that he did not observe NGC 7100, and did observe NGC 7101.
Physical Information: Apparent size 0.5 by 0.5 arcmin?

Historical Identification: Per Dreyer, NGC 7102 (= GC 6003, Marth #449, 1860 RA 21 32 43, NPD 84 20) is "faint, pretty large, round". (See IC 5127 for a discussion of the duplicate listing.)
Physical Information: Apparent size 1.6 by 0.9 arcmin?

Historical Identification: Per Dreyer, NGC 7103 (Muller list II (#461), 1860 RA 21 32 48, NPD 113 06.0) is "very faint, very small, round, gradually brighter middle, 1st of 2", the other being NGC 7104. The first IC changes the minutes and seconds of RA (per Ormond Stone) to 31m 55s.
Physical Information: Apparent size 1.4 by 1.2? arcmin

Historical Identification: Per Dreyer, NGC 7104 (Muller list II (#462), 1860 RA 21 32 48, NPD 113 04.0) is "very faint, very small, irregularly round, gradually brighter middle and nucleus, 2nd of 2", the other being NGC 7103. The first IC changes the minutes and seconds of RA (per Ormond Stone) to 32m 06s.
Physical Information: Apparent size 0.7 by 0.6? arcmin.

Historical Identification: Per Dreyer, NGC 7105 (Leavenworth list I (#242), 1860 RA 21 33±, NPD 100 58.1) is "faint, very small, extended 130°, suddenly much brighter middle and nucleus, star to northwest". The second IC states "Not found by Howe (3 nights)".
Physical Information: Apparent size 1.0 by 0.5? arcmin

Historical Identification: Per Dreyer, NGC 7106 (= GC 4688 = JH 3879, 1860 RA 21 33 00, NPD 143 20.5) is "extremely faint, considerably small, a little extended, very gradually a little brighter middle".
Physical Information: Apparent size 1.7 by 1.0? arcmin

Historical Identification: Per Dreyer, NGC 7107 (= GC 4689 = JH 3880, 1860 RA 21 33 22, NPD 135 25.6) is "very faint, considerably large, round, very gradually a little brighter middle".
Physical Information: Apparent size 2.1 by 1.5? arcmin

Historical Identification: Per Dreyer, NGC 7108 (= GC 6004, Marth #450, 1860 RA 21 33 31, NPD 97 24) is "very faint, small, round, stellar".
Discovery Note: See NGC 7111 for a discussion of the considerable confusion about Stephan's date of discovery for what turned out to be a duplicate entry.
Physical Information: Apparent size 1.4 by 0.9? arcmin

Historical Identification: Per Dreyer, NGC 7109 (= GC 4690 = JH 3881, 1860 RA 21 33 32, NPD 125 04.9) is "extremely faint, very small, among stars".
Physical Information: Apparent size 0.7 by 0.7? arcmin

Historical Identification: Per Dreyer, NGC 7110 (= GC 4691 = JH 3882, 1860 RA 21 33 48, NPD 124 48.2) is "faint, small, round, brighter middle".
Physical Information: Apparent size 1.3 by 0.6? arcmin

Historical Identification: Per Dreyer, NGC 7111 (= GC 6005, Stephan list IV (#5), 1860 RA 21 34 30, NPD 97 20.7) is "extremely faint, extremely small, round, brighter middle".
Discovery Note: Stephan first observed his IV-5 on Aug 28, 1872, and "reduced" its position relative to other objects to a right ascension and declination on Aug 31, 1872; but in several references "Aug 31" was accidentally changed to "Sept 31", and the later date, whether right or wrong, is the one usually shown in references as the date of discovery (as it was here, until the end of 2023).
Physical Information: Given the duplicate entry, see NGC 7108 for anything else.

Historical Identification: Per Dreyer, NGC 7112 (Swift list IV (#81), 1860 RA 21 35 34, NPD 78 03.3) is "most extremely faint, small, round, pretty bright star close to west". The second IC notes "Not found by Howe (2 nights)".
Physical Information: Apparent size 1.4 by 1.4? arcmin.

Historical Identification: Per Dreyer, NGC 7113 (= GC 6006, Marth #451, 1860 RA 21 35 40, NPD 78 01) is "very faint, small, stellar".
Physical Information: Given the duplicate entry, see NGC 7112 for anything else.

Historical Identification: Per Dreyer, NGC 7114 (1860 RA 21 36 13, NPD 47 47.7) is "a nebulous variable star, a planetary nebula?" The object in question is Nova Cygni 1876, which was discovered by Schmidt, then observed and discussed by Copeland, who concluded that it must be a planetary nebula based on its single-line emission spectrum. Lohse claimed (as stated in a note at the end of the NGC) that it was surrounded by nebulosity, hence Dreyer's inclusion of the object in the NGC (despite not giving any credit for its discovery), but no nebulosity was ever seen by any other observer.
Physical Information: As a 3rd magnitude nova, easily visible in 1876, but now long faded from view save with a telescope. Note: Though some early observers thought that the star looked slightly nebulous, the only real evidence that it created a planetary nebula is the fact that early spectroscopic observations did not show the continuous "black-body" spectrum of a star, but only a single-line emission spectrum, which is more typical of an emission nebula.

Historical Identification: Per Dreyer, NGC 7115 (Leavenworth list I (#243), 1860 RA 21 36 15, NPD 116 00.2) is "very faint, pretty small, much extended 90°, cometic, 2 stars involved". The second IC lists a corrected RA (per Howe) of 21 35 35.
Physical Information: Apparent size 1.7 by 0.4? arcmin

Historical Identification: Per Dreyer, NGC 7116 (= GC 6007, Marth #452, 1860 RA 21 36 29, NPD 61 41) is "very faint, pretty large, much extended".
Physical Information: Apparent size 1.1 by 0.4? arcmin

Historical Identification: Per Dreyer, NGC 7117 (= GC 4692 = JH 3883, 1860 RA 21 36 33, NPD 139 04.0) is "faint, small, round, gradually a little brighter middle, western of 2", the other being NGC 7118.
Physical Information: Apparent size 1.4 by 0.8? arcmin

Historical Identification: Per Dreyer, NGC 7118 (= GC 4693 = JH 3884, 1860 RA 21 36 57, NPD 138 59.8) is "faint, small, round, gradually a little brighter middle, eastern of 2", the other being NGC 7117.
Physical Information: Apparent size 1.4 by 1.1? arcmin

Historical Identification: Per Dreyer, NGC 7119 (= GC 4694 = JH 3885, 1860 RA 21 37 11, NPD 137 09.6) is "faint, small, round, gradually brighter middle".
Physical Information: One of an interacting pair of galaxies, presumably seen as a single object by Herschel (1.2 by 0.9? arcmin)

Historical Identification:
Physical Information: One of an interacting pair of galaxies, presumably seen as a single object by Herschel (0.6 by 0.3? arcmin)

Historical Identification: Per Dreyer, NGC 7120 (= GC 6008, Marth #453, 1860 RA 21 37 12, NPD 97 10) is "very faint, small, very little extended".
Physical Information: Apparent size 0.8 by 0.4? arcmin

Historical Identification: Per Dreyer, NGC 7121 (= GC 6009, Stephan list IV (#6), 1860 RA 21 37 36, NPD 94 14.7) is "very faint, very small, round, very little brighter middle".
Physical Information: Apparent size 1.1 by 0.6? arcmin

Historical Identification: Per Dreyer, NGC 7122 (= GC 4695, Markree, 1860 RA 21 38 21, NPD 99 28.5) is "a nebulous star of 10th or 11th magnitude or a very small cluster (Auwers 47)".
Discovery Notes: Markree is the name of Cooper's observatory, while Auwers 47 refers to the catalog in which John Herschel found the record of Cooper's observation.
Physical Information:

Historical Identification: Per Dreyer, NGC 7123 (= GC 4696 = JH 3886, 1860 RA 21 38 40, NPD 160 58.7) is "pretty bright, small, round, very gradually brighter middle, 9th magnitude star to east".
Physical Information: Apparent size 3.0 by 1.1? arcmin

Historical Identification: Per Dreyer, NGC 7124 (= GC 4697 = JH 3888, 180 RA 21 38 45, NPD 141 12.8) is "pretty bright, large, pretty much extended, very gradually brighter middle".
Physical Information: Apparent size 2.8 by 1.1? arcmin

Historical Identification: Per Dreyer, NGC 7125 (= GC 4698 = JH 3887, 1860 RA 21 38 56, NPD 151 21.3) is "extremely faint, pretty large, round, southwestern of 2", the other being NGC 7126.
Physical Information: Apparent size 3.0 by 2.1? arcmin

Historical Identification: Per Dreyer, NGC 7126 (= GC 4699 = JH 3889, 1860 RA 21 38 59, NPD 151 15.2) is "pretty bright, pretty small, a little extended, gradually brighter middle, northeastern of 2", the other being NGC 7125.
Physical Information: Apparent size 2.8 by 1.3? arcmin

Historical Identification: Per Dreyer, NGC 7127 (= GC 4700 = JH 2129, 1860 RA 21 39 09, NPD 36 01.4) is "a cluster, small, poor, a little compressed".
Physical Information: About 6? arcmin wide

Historical Identification: Per Dreyer, NGC 7128 (= GC 4701 = JH 2130 = WH VII 40, 1860 RA 21 39 17, NPD 36 56.3) is "a cluster, small, pretty rich, has a ruby star of magnitude 9.5".
Physical Information: About 4? arcmin wide

Historical Identification: Per Dreyer, NGC 7129 (= GC 4702 = JH 2131 = WH IV 75, 1860 RA 21 39 45, NPD 24 32.3) is "a remarkable object, considerably faint, pretty large, gradually brighter middle, triple star", the reference to the star presumably referring to the cluster inside the nebula.
Physical Information: About 7? arcmin wide

Historical Identification: Per Dreyer, NGC 7130 (= GC 4703 = JH 3890, 1860 RA 21 39 52, NPD 125 05.7) is "pretty bright, small, round, gradually a little brighter middle".
Physical Information: Apparent size 1.6 by 1.5 arcmin? DSS images show only a poorly defined object; but Hubble Legacy Archive images show that the DSS "object" is a vastly overexposed image of the galaxy.

Historical Identification: Per Dreyer, NGC 7131 (= GC 6010, Marth #454, 1860 RA 21 40 01, NPD 103 53) is "very faint, small, very little extended, very gradually brighter middle".
Physical Information: Apparent size 1.7 by 1.0? arcmin

Historical Identification: Per Dreyer, NGC 7132 (Swift list II (#89), 1860 RA 21 40 47, NPD 80 24.5) is "very faint, pretty large, a little extended, between 2 stars". The first IC says "Seconds of RA should be 25 (per Spitaler)".
Physical Information: Apparent size 1.1 by 0.7? arcmin

Historical Identification: Per Dreyer, NGC 7133 (Bigourdan (list II #91), 1860 RA 21 41 10, NPD 24 28.5) is "very faint, pretty large".

Historical Identification: Per Dreyer, NGC 7134 (Peters, 1860 RA 21 41 20, NPD 103 37.7) is "pretty faint, very small, 11th magnitude star to north". The second IC says "No nebula, only 3 or 4 very faint stars (Howe)".

Historical Identification: Per Dreyer, NGC 7135 (= GC 4704 = JH 3891, 1860 RA 21 41 22, NPD 125 31.7) is "pretty bright, pretty large, round, very gradually brighter middle, 14th magnitude star attached on west".
Physical Information: Apparent size 2.1 by 1.8? arcmin

Historical Identification: Per Dreyer, NGC 7136 (Muller list II (#463), 1860 RA 21 41 25, NPD 102 26.2) is "extremely faint, very small, round (nebula?), 9.5 magnitude star 2 arcmin to east". The second IC says "RA 21 42 10, stellar, nebulosity doubtful (Howe)".

Historical Identification: Per Dreyer, NGC 7137 (= GC 4705 = JH 2132 = WH II 261, 1860 RA 21 41 44, NPD 68 29.3) is "faint, pretty small, round, very gradually a little brighter middle, mottled but not resolved".
Physical Information: Apparent size 1.6 by 1.4? arcmin

Historical Identification: Per Dreyer, NGC 7138 (= GC 6011, Marth #455, 1860 RA 21 42 14, NPD 78 09) is "very faint, very small, stellar".
Physical Information: Apparent size 1.2 by 0.5? arcmin

Historical Identification: Per Dreyer, NGC 7139 (= GC 4706 = WH III 696, 1860 RA 21 42 15, NPD 26 49.5) is "very faint, considerably small, round, mottled but not resolved".
PGC Designation Note: For purposes of completeness, LEDA assigned a PGC designation for this object, even though it isn't a galaxy; however, a search of the database for that designation returns no result, so the designation is shown quotes.
Physical Information: Apparent size 1.3? arcmin

Historical Identification: Per Dreyer, NGC 7140 (= GC 4707 = JH 3892, 1860 RA 21 42 29, NPD 147 12.1) is "pretty faint, considerably small, round, brighter middle".
Physical Information: Apparent size 4.1 by 3.0? arcmin

Historical Identification: Per Dreyer, NGC 7141 (= GC 4708 = JH 3893, 1860 RA 21 42 30, NPD 146 13.6) is "faint, large, round, gradually then pretty suddenly much brighter middle (? = h 3892)", the query implying that this may be a duplicate of (JH) 3892 = NGC 7140 with a one degree error in the position (as turned out to be correct).
Physical Information: Given the duplicate entry, see NGC 7140 for anything else.

Historical Identification: Per Dreyer, NGC 7142 (= GC 4709 = JH 2134 = WH VII 66, 1860 RA 21 42 34, NPD 24 50.7) is "a cluster, considerably large, considerably rich, pretty compressed, stars 11th to 14th magnitude".
Physical Information: Apparent size 12? arcmin

Historical Identification: Per Dreyer, NGC 7143 (= GC 4710 = JH 2133, 1860 RA 21 42 41, NPD 60 41.5) is "very faint, perhaps a double star (involved in a nebula?)".

Historical Identification: Per Dreyer, NGC 7144 (= GC 4711 = JH 3894, 1860 RA 21 43 34, NPD 138 54.5) is "very bright, pretty small, round, much brighter middle and nucleus".
Physical Information: Apparent size about 3.7 by 3.6 arcmin (verified by the Carnegie-Irvine image below). Used by the de Vaucouleurs Atlas of Galaxy Types as an example of galaxy type SA0^-.

Historical Identification: Per Dreyer, NGC 7145 (= GC 4712 = JH 3895, 1860 RA 21 44 13, NPD 138 32.4) is "bright, small, round, in triangle of 13th magnitude stars".
Physical Information: Apparent size 2.5 by 2.3? arcmin

Historical Identification: Per Dreyer, NGC 7146 (= GC 6012, Marth #456, 1860 RA 21 44 42, NPD 87 37) is "faint, round".
Physical Information: Apparent size 1.0 by 0.6? arcmin

Historical Identification: Per Dreyer, NGC 7147 (= GC 6013, Marth #457, d'Arrest, 1860 RA 21 44 52, NPD 87 34.9) is "faint, small, a little extended".
Physical Information: Apparent size 1.0 by 0.9? arcmin

Historical Identification: Per Dreyer, NGC 7148 (= GC 6014, d'Arrest, 1860 RA 21 45 02, NPD 87 18.9) is "very faint, very small, round." The position precesses to (2000) RA 21 52 07.0, Dec +03 20 23, about 0.4 arcmin west-southwest of the pair of stars listed above (the faint galaxy to their south is far too faint for anyone to have seen in the 1800's). Many similar pairs and triplets of stars in the NGC have similar descriptions, and there are no galaxies nearby, so the identification is essentially certain. However, due to an error to the notoriously inaccurate RNGC, SIMBAD and HyperLEDA list IC 1407, which lies well to the northeast, as NGC 7148, and as a result, so do many image databases, hence the need for the warning about that mistake in the title for this entry. (Fortunately, NED, probably thanks to Harold Corwin's contributions to that database, correctly lists NGC 7148 as the pair of stars listed above.)
Discovery Notes: d'Arrest observed this region three times on September 15 and 19 of 1865, with positions for this "object" differing by only 2 seconds in RA and 0.6 arcmin in declination, so there is no chance that any object more than a couple of seconds of time or an arcmin in declination from his position could possibly be what he observed. On Sept 15 he wrote (1) "Very weak, weak, undercut. Several similar ones in the neighborhood", and (2) "Very small and very thin. Confirmed amplification of 160. (The other object) is similar to this one." On Sept 19 he wrote "Small and very dark. Another in the vicinity to the south. Verified by amplification (magnification) 231." Given the positions of the three observations, at the time of his observations he must have thought that he was observing different objects; but in his compilation of all his observations, he assigned all three observations to the same object, which became NGC 7148. These descriptions fit a pair of stars far better than Dreyer's summary, and make the identification absolutely certain.
 Everything written above is based on my own research, but I am pleased to say that notes written by colleagues confirm my conclusions. Gottlieb states that the misidentification was in the RNGC, and notes that HyperLEDA also misidentifies NGC 7148 as IC 1407. Corwin also confirms that, and writes that he originally called this a double star, but that SDSS images show that the northeastern "star" is a very close double, so that there are actually three stars in the group. Corwin also writes that d'Arrest's observations of NGC 7149, made on the same nights, show that NGC 7148 is 2.5 arcmin to the north of NGC 7149, which means that it must be the triplet listed here, and also notes that the magnitude 17.7 galaxy to the south of the triplet of stars is many magnitudes too faint to have anything to do with d'Arrest's observations. Finally, Vizier confirms the RNGC error by showing that the position listed in the RNGC for NGC 7148 is essentially the same as the position of IC 1407.
Physical Information: Per Gaia, the westernmost star has a G-magnitude (similar to but not the same as the visual magnitude) of 14.9, the eastern member of the eastern pair of 15.2, and the western member of that pair of 16.1.

Historical Identification: Per Dreyer, NGC 7149 (= GC 6015, d'Arrest, 1860 RA 21 45 07, NPD 87 21.4) is "very faint, very small, round".
Physical Information: Apparent size 1.3 by 0.9? arcmin