Gentlemen,
A nice discussion and I think the dot on the 1920 rework isn't a hardness test, although the dots on regular gun parts most definately are.
I believe this pistol, number 103. had the dot in order to prevent the number being interpreted as 801 (upside down). There is a good chance that the armory this pistol came from simply had a pistol numbered 801, 901 or 601 and the dot was added to secure the gun parts with the correct gun.
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