Rare WW2 Artillery Shell Casing

[Barefeets]

This is a WW2 all brass, 3" Mark ii M2 artillery shell casing dated 1944. I can't find another anywhere on the web that matches. I paid $20 for it with intentions to sell but unless it is worth quit a bit i believe i'll hang on to it. Opinions on value?

 

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[vpnavy]

I searched Google and got a lot of hits - here are just a few...

WW LL 3 INCH MARK II ARTILLERY SHELL CASING NO RESERVE
WW2 US 3inch Mk2 M2 Shell Case
US WWII 3IN MK-7 SHELL CASING DATED 1944​