The "Type Parentage" menu deals with all the differences.

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The figure on the left shows the mechanism for obtaining Type III. The effigy in black is an enlargement of the Workshop proof (comparable to Type IV). Under the buckle of the belt the fold on the far right is broken on the Type III (blue arrow)... 

Same for Type I, how to explain the disappearance of the relief (blue arrow) when printing Type III. We repeat the same assumptions:

- Hypothesis 1 which is in my favour. An action of the engraver at the level of the service punch

- Hypothesis 2, a hazard (shock, others) on the service punch

- Hypothesis 3, bad copper plating of the service punch, whereas to think of the copper plating of the standard galvanos, all identical. I don't think that the copper plating by electroplating (electroplating) is in question...

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