Antique Pocket Watch Lookup Sites

 Check this site for the maker & to date your pocket watch (I think this is only American but I will confirm another time)

https://pocketwatchdatabase.com/

If silver, then check the silver maker mark

http://www.silvercollection.it/englishsilvermarksXWDUE.html

Understand more through this forum

https://mb.nawcc.org/threads/help-pocket-watch-unknown-hallmarks-maker-year-city-history-if-possible.55492/