✅ SOLVED can anyone interpret a military style headstamp?

[Older The Better]

Found this the other day I think its a .45 and from what I could find its probably military from after WWI but can anyone tell me what each letter/number represents?

 

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[Charlie P. (NY)]

.45 ACP

FC is the arsenal (or, in this case, Federal Cartridge Company)

61 is the year - 1961

 

[Older The Better]

ahhh I was looking at it as 4 separate characters not two groups, cool thanks for the help