bullet casing identification

[keithinvestigations]

I'm new to the forum and the sport. So far I haven't found much. Today I found a bullet casing at my town's train depot which I think is an interesting place to find such an item. Anyway the casing has nice patina and has the markings "E C 42." Any idea what caliber or type of gun would use such a bullet?

 

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[nc-joe]

From what I have just recently learned, the "42" most likely represents "1942" and it would be a military shell since there is no caliber identification.

 

[SomeGuy]

Hard to see from the photo, but looks like a .45 ACP, used in Colt pistols, Thompson sub-machine guns and M3 "grease guns".

Definitely US military, Go here for more info on manufacturer:

http://cartridgecollectors.org/ww2usmfrs/