Hi, I have this 37mm shell, which I'm told is French. However, it doesn't fit any of the ones I know. It's pretty long, 106mm and has 2 large driving bands and no grooves on them. The base unscrews and seems to be just et plug. No trace of any fuze. Does anyone knows what this shell is? It came on a 37-85 trench art case, but I don't think they were meant to be together.