Jim, WOW!!!

Yes, that's a riveted 'Roughback' Maurice Johnson 'C' model sheath from the late 1960's, and is correct for the knife with exposed brass nut (no later than very/very early 1970's)... Awesome dude, awesome knife!

With a 'five count' & brass spacers, I wonder if the knife wasn't Shop rehandled at some point in the past? I kinda doubt it though, as the knife doesn't appear to have been cleaned...cool stuff Jim, cool stuff indeed...