John,
The tools are indeed rather elegant good/no good tools. Some show the tolerances (for example + or - 1mm), others don't. Many have the good coded as a yellow color, and the no good side as red.
The L (for example with L52) means "Lehre nr. 52", or "Tool nr. 52". The tools appear to be numbered in groups, attached to certain main parts like Mauro mentioned.
I don't know whether the threading is Euro or US style, but the design of the barrel thread area differs from the pre-1945 design. The newer design allowed for easier placement of the barrel without having to remove material from the shoulder in order to get a good alignment.
The holes in the grip tool do not correspond with the pin holes for the grips, so they seem to have a different purpose.
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