I have seen these markings on another site years ago. I think it is a french 37MM or also know as a 1 pounder.
I will have to search to see if I can find it again.
It is a very detailed and talented piece of workmanship for US trench art.
I'm sure one of the Arty experts will be along soon to let you know exactly it is that you have.
I found it. I hope I am not violating any site rules but here is a discussion about that type of shell.
WW1 artillery shell casing? - Wehrmacht-Awards.com Militaria Forums
If I need a flogging just let me know!!!!
Thanks for your help, Phil!
You're welcome Martin. I hope that was what you were looking for!
My Granddad had similar ones made for himself in WW1.
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Nice hat I have a couple myself, pictures of complete 37mm shells.
Dear Phil, Ade and Z4,
Thanks for your time and input i appreciate it. I love this forum!
Have a good day!
I have a few hats but this is the only one not packed away.
GFSP GeschossFabrik Spandau
size 7,7 cm
lot number 160
st strengthened case