To be matching, the sheath and blade should both have the same serials. S/185G on the sheath should be the serial number for the manufacture of that sheath and should be traceable (not 100% sure as my bayonets have no sheaths but this is what I read), 8446a will be the serial that matches the bayonet with the rifle it was made for, F.HERDERA will be the manufacture stamp of who made the blade, and 438 should be part of the manufacture codes that would allow you to trace the date. Both the bayonet and sheath should have identical serials that match so as to be a matching set. I will take some time later on today and look at my 1938 bayonet and confirm what I posted.