Thank you all for your input. Based on your input, I did a Google search for "Owen submachinegun bayonet" and saw lots of my scabbards in the pics. As Mr. Laidlericon pointed out, the combination is not "as issued" correct, so someone mated the two at some point in the past. I know of 4 other scabbards like mine and I'm going to contact the owners to see if they are all marked OA. If so, this could support the speculation that these scabbards were an Austalian initiative. It would be nice if a knowledgeable Aussie chimed in with a confirmation. On another note, my bayonet is marked "M47A" on the pommel with the "crows foot" WD arrow. Does this denote the manufacturer and the year?