Need information about your watch based on the movement serial number?
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
IWC International Watch Company