I purchased this 20 MM cannon shell a few years ago because I thought it was unesual. It was a real pain to photograph because it is all black with some dark red stenciling so I tried many back drops for contrast. Excuse the tortoise, but its shell worked great for my camera to pick-up the red. Could not take a pic indoors. Any how, I was told that is may be German manufactured for US use? No clue! Any help would be great.
I hope you can see the RED T Shaped Markings. It was real hard capturing them in these photos.
PS: The tortoise is a primitive “ANTI MINE DEVISE”