Vintage, Original, Authentic HAMILTON WATCH COMPANY "Everest" Plastic Crystals (3 per order).
Manufactured by Germanow-Simon (G-S) Machine Co in Rochester, NY USA for Hamilton.
Each crystal is in its own separate and unopened G-S paper envelope, labeled with part # CMF700, "Hamilton", measurements, etc.
Hamilton offered these plastic crystals to their customers as an alternative to the original glass crystals . The original glass crystals were more easily broken causing further damage to the watch resulting in expensive repair costs.
NOS = New Old Stock
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