Help on Proof ID...

[Heydrich]

I had a long-time collector tell me that is a French capture mark. And I once saw a G43 that had that stamp on the receiver above the serial number. As it appears on Kar.98k bayonets, as well as G43s, it is not inclusive to the Mauser Oberndorf plant. And it’s certainly not an “end of production run” stamp in my opinion.