Steve,
Good effort.
In order to narrow down the transition between models it is advisable to divide the types into 3 categories, instead of 2:
Category one: 29/70 model, Swiss lay-out.
Category two: 06/72 model = 29/70 - 06/73 transitional model with 08-style grip and Swiss style small parts (takedown lever, trigger, safety and sideplate).
Category three: 06/73 model, 08 style.
I almost forgot:
Pistols for the US market usually only have the FBM proof without proof date code. If a pistol was proofed in Germany (Ulm), there will be a 2-digit or 2-letter year code. It is also interesting to record that 2-digit year code.
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