I have had this round for over 15 years. I just ignored it since the jar it came in was full of very interesting rounds from an interesting source, and this looked like a corroded bit of junk. Today I was digging around in the box picking out a set of items for ECRA, and decided to take some steel wool to the headstamps and had a real surprise. The headstamp is WWI German!
And the case is copper plated steel.
This made no sense since the dimensions are all wrong for a 7.9x57mm Mauser
overall length: 61.7mm
Case length:: 42.5mm
bullet dia: 8.17mm
head dia: 11.91mm
One side of the case has some deformation as shown like it may have been resized. I would consider it someone’s dingbat except it came to me directly from an individual who had held important arms and arms positions in the US Army during WWII and after the war worked for other government activities. He is mentioned by name in HWS, Vol III and I am sure Frank Hackley would recognize his name. His government work also resulted on a close relationship with the White Lab He was not a collector nor a tinker. He gave me his “Reference Box” which contained this round. I wonder if it was made by a friend as a joke, but I don’t believe he was the kind of guy who would have kept it in his Reference Box.
I suspect it still belongs in a junk box, but would appreciate opinions!