I think this is a ulysse nardin retailed by turler

 By: americano : November 19th, 2018-17:11

Why do you think so? [nt]

 By: amanico : November 19th, 2018-22:47
No message body

Hi Amanico

 By: americano : April 30th, 2019-11:15
First the dimensions and stern dial ofcourse !!
But I browsed old catalogs look the same

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.

Normally, UN's PW chronograph movements were signed ...

 By: Marcus Hanke : May 3rd, 2019-00:23
... and were finished to a high level. This does not really appear to be one, but I can be wrong, of course.