So " UMC - UEE " = ?
UEE = Union Espanola de Explosivos.
From Cartridge Headstamp Guide, First Revision, White & Munhall, 1977-
“…made by Remington Arms-Union Metallic Cartridge Company in 1917 especially for the Union Espanola de Explosivos of Spain.”
Nice and hard to find.
Another more …
Please go to the “6.35 Browning Headstamps” post
Can you identify headstamps #3 and #4?
I had also posted a UMC-UEE 6.35m/m
Very nice and thanks for posting.