Serial Number Lookup
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Need information about your watch based on the movement serial number?
Most American Pocket Watches.
Elgin parts list and cross reference. This will allow you to type in the grade of your Elgin pocket watch, and show you all the part numbers for the various parts. You can also type in a part number and get a list of all grades using that part number. (thank you Clint Kleen!)
Gruen - new Gruen dating method using serial number from movement
Gruen- new Gruen dating method using style number from case
Hamilton or Hamilton
Illinois 12 size lookup (thank you Jim Carrol)
IWC International Watch Company
Waltham or Waltham (includes links to the original hand-written records)