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Epos Triple Date Moonphase Chronograph Valjoux Caliber 7751
Omega Seamaster 30 Caliber 286 circa 1963
Omega Speedmaster Professional Caliber 863
Omega Speedmaster Automatic Caliber 1045 vs. 1040/1041 Case Differences
Fabricating a display back for an Omega Seamaster 30
How to cut a display back
Longines Caliber 12.68Z circa 1940's
Ollech & Wajs Precision
Gallet Excellsior Park 1950's
Ball Waltham Railroad Grade Pocket Watch