Well, the base movement appears to be a very nicely finished Venus
By: NickO : February 14th, 2013-16:51
Split-seconds, so that narrows it to the calibers 179, 185, 189 and 190. Hard to say more. So it could have two or three registers, and in the case of the 190 also add a date and a moon-phase. Oh, and I don't see any side chrono pushers, so looks like it ...