Original shell casing dated 1944, probably from an M18 or M35 tank destroyer as it came from the estate of a veteran in a tank destroyer unit. Really nice condition, just needs some polishing. 
SHIPPING NOTE- This is very heavy so shipping will be between $25-30 depending on your location. Please disregard the calculated shipping on the website and send me an order request (pay off-line option) and I can calculate the exact shipping for you. Thanks!