37x145mmR "37mm MkIII A2 Lot 4 49 1944"

I walked into a local gun shop and took pics of this (I suspect) 37x145 round. It was not for sale.

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Very nice! Used in the 37mm automatic cannon on P-39s & PT boats.

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It looks like maybe an M54 High Explosive:
image

Also used in the P-63 Kingcobra.

-Larry

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