Silver Pocket Watch enquiries

Hi all
1st timer here! I need some help in identifying the origins of a small silver pocket watch that has recently been left to me!
The info inside the watch back is as follows:-
925 in a circle
a “U” in a circle
A “O” in a square
DBs in a square
and the Nos 120943 with a 2 on it’s side ! I have tried to research this but keep being asked for a silver mark to start!! Anyone know who made it, when and from where please??? This also has inside cover Swis Made! Apperciation in advance!
Tony :unamused: