The dimension of the dies, and their typeface changed subtly from time to time.
The government acceptance requirements didn't specify the size or typeface of the die digits.
The most useful thing I have found is to have seen known good serial number die stampings. You can do this with actual pistols (if you know people with collections) or in well done photographs. The Sturgess book would be my go to reference. You can get a PDF copy of the book from Simpson Ltd at a reasonable price.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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