1.5mm is a reasonable size for a small pin; roughly equivalent to 1/16" in the English system.
I have no doubt that it was chosen as it was sufficient, and of the appropriate "standard" and readily available size.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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