So I thought I'd take a run at sorting out the late Aerocompaxes. This is restricted to those models with non-UG/Martel power and it's all very tentative, so feel free to jump in with catalog info, reference numbers, opinions, comments, additions and refinements. The first division I'll make is between 12 hour and 24 hour dials. The 12hr watches seem to be designated UG Cal 130 (which looks like a Valjoux 726) and the 24hr watches UG 90 (Venus 178). Let's tackle the 12 hr variants first. Since we don't know the temporal sequence, I'm just going to call them Type A, B, etc. Type A 12HR (photo credit m neuman I think) Type B 12HR (photo credit unknown) Type C 12Hr (photo credit Paul Gavin) and the 24 hr versions Type D 24HR (photo credit j-luc) Type E 24Hr (photocredit Gavin) thanks to Gavin, we known this is a ref 890101/01 http://omegaforums.net/threads/squirrel-bites-late-aerocompax.7233/ Type F 24Hr Ref 890100/01 per woodwkr anyone got anything else?