Hello, i hope that somebody can help me to find any information about this fuze, the fuze has a ring in the middle that you can turn, if you turn the ring you can arm the fuze, on the body you see Scharf and Sicher, the fuze will fit on the SD 10, i think that the fuze has been used for water targets like Uboats, but again i am not sure, i hope that somebody can help me. Thanks Ben