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Some Helpful Watch Related Sites:
A History of Horology, Clockmaking, and Watches
America's Finest Watch: Hamilton Watch Co.
Gruen; the Art & Mystery of Watchmaking, 1874- 1958
GruenWristwatches.com A place for Gruen watch fans to meet
Automatic-:Winding-Some Significant Dates
Elgin & Waltham Production dates
IWC Serial Numbers Indicating Production Dates
Jaeger-LeCoultre Futurematic
Longines Year Identifier
Omega Serial Numbers by Year...
Omega Watches: Vintage Watches Database
Ranfft Movement Database
Rolex Serial Numbers
Watchmaking Glossary|WatchTime.com
WW II US Military Wristwatches