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William the serial number is #11042881. I got the info from here. http://pocketwatchdatabase.com/ and had to do addition research for the staff and mainspring. Only the elgin has a tab after you put the serial # in that has a parts tab. The rest don’t. Anyway that is as close as I could come up with. Looking for a Bestfit 111 and 111A although not sure I need the 111A.