Alberto,

Pardon me for being caliber confused. Whenever I see a movement I do not recognize readily I go to the Bible of movements in the back of the Gerd-R Lang book and see if I can make a match.

The picture should explain my confusion and my failure to note the stem opposite the pushers on your watch. Of course it is the same as the OTD reference watch which could confirm your suspicion of a close relationship.

Compared to most pics of the cal 11,12,13,14 etc movements there still appears to be some parts missing probably to do with the hour register.

I had not regognized this previously but the valjoux 7740 looks like a cal 11,12,13,14 etc with the stem moved to the pusher side.

I am not surprised as the valjoux 7730 came fron the venus 188.

My apologies for any confusion I may have generated.

David