Hi, I'm new to this forum and I was hoping someone could help me identify a socket bayonet I recently bought. I searched the internet for hours and could not find out what type it is. It measures 24" in total. Socket measures 3". Its hard to tell form the pictures, but CSA is stamped on the side of the socket. The blade has an "M" marked in a circle. A "3" is stamed on the ricasso, and a unidentified stamp. 7247 serial number.