MK-6 Navy Practice rounds During the early 1940's, German U-Boats were sinking so many of our Merchant Ships, that the Navy installed one of these guns on the front deck of each ship, with a special crew to man them. These are the original practice rounds used in training our sailors. Great for décor, doorstop, conversation piece, etc. You may find other practice shells, but none this unique. The beautiful turned oak is rugged yet elegant. Dated 1944, they are a true piece of artillery memorabilia. Still in original box but there has been some degradation overtime . mostly in very nice conditon but will probably need some clean up and or rust removal if you want to polish them up .trench art *heavy item-expect extra shipping charges. all wood version is called mk-6. price is for one. your choice of all wood , or part metal.