Aaron, I completely agree with Dwight in regards to Constanzo's unparalleled documentation of proof marks but lacking in correctness in accurately identifying them (is there one marking in the entire book where he admits not knowing the meaning of?). This stamp is the marking of HZa Magdeberg without a doubt. I have a particular interest in Hza markings, and have never seen this variation before, but everything about it adds up (number/letter configuration, placement on pistol). I have a broomhandle Mauser with the later straight-wing eagle Mg10 stamp on the grip back-strap. Also, this is a post-1933 stamp and indicates the pistol could have been reworked all the way up to 1937 (when the straight-wing eagle came about). Thanks for sharing it with us. Ryan
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