Ulysse Nardin

Hello,

I was wondering if anyone might be able to provide me with some information about my UN. It is a vintage triple date moonphase moonphase from the 1940s/50s. I have not been able to open up the case back case back, but the movement is manual wind with sub-second sub-second and quickset quickset the date, month, and moonphase. The square stainless steel case is 31 mm by 31 mm. It looks very similar to the square Omega Cosmic Moonphase, but it has a black dial and Arabic numerals. I think the movement inside is a Venus Caliber 203. It would be great to hear any information about the watch or the movement. I am also curious if anyone has seen a similar piece. 

Here are some photographs of the watch:

Thank you.

Best, Sam  

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