My uncle who gifted me this watch said it was a prototype they did in bienne in the 1940ies. He was working for Omega as general manager or so, then.
He mentioned a limited edition for the vatican, thus the cross in the lower half.
I am willing to let this one go - so just make me an offer for this incredibly rare specimen. I am willing to trade for a german car (BMW/Audi/etc...) 2014 or later