Hi,My name is***** have been dealing in and appraising pocket watch for over 40 years, and I can help you with this. Is the serial number that you provided on the watch case or the movement aka works?
If you could open the back and tell me the number on the movement, this is the serial number that actually dates the watch. Case numbers are not reliable on most pocket watches as watch case companies made cases for several watch companies.
If you have pen knife you can pry it open or you can take it to jeweler and they can open it.