This Hamilton 645 is unusual, because of the Swissonic movement, as Hamilton had an own movement, the 505 at that time. Also this watch has no removable back, the movement can only be accessed by removing the glas. Signed front: “Hamilton, Electronic”, back: ”Hamilton,10 K R.G.P. (Rolled Gold Plate)”, in the back: “Hamilton Co., Lancaster PA., 10K Rolled Gold Plate, P446354, Star W.C. Co., 980569”.
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