Hi Joe,
...but a completely different movement - if memory serves well this is 12 or 11 1/2 ''' only to start with. It was used quite a lot by UN, with different levels of finish, around that time and in fact is a very nice movement. The base movement, again if memory serves well, is a FHF cal. 26 or 27.
IIRC it was also used with a triple calendar plate, but not that easy to find.
Best regards
Suitbert