Marcus Hanke[PuristSPro Moderator]
11591
Normally, UN's PW chronograph movements were signed ...
... and were finished to a high level. This does not really appear to be one, but I can be wrong, of course.
Marcus
Serial number
By: itt : March 30th, 2019-19:20
UNs archive works off the movement serial number. Their archive is not complete but you might be lucky if it is from their factory. Personally, at this time I cant see any evidence that it is.