Argentinian, made in 1954.
Probably standing for Fabrica Militar Cartouces, or something similar, with SL being the location of the plant.
Is there a nice big burr extending from the center flash hole INTO the primer pocket?
If so, you've punched a Berdan primed case. Toss it.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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