So there are 3 parts to this stamping if I understand it correctly.
HZa refers to a company
Jt is a abbreviation for Jngolstadt
13 is the depot number
The number 13 is difficult to distinguish, but knowing that is what it is, I suppose I can see it.
The last 2 numbers of the serial numbers are stamped and overstamped on the correct parts, but one on the toggle wasn't done very well.
Also the last 2 numbers were applied to the toggle pin, an indication of Nazi era rework.
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