Upon researching the Astronaut knives, I stumbled on to a sheath that I'm not sure is a Randall sheath. It has a mod 15/17/18 lower rivet configuration, but it has what looks like a mod 14 length with extra rivets. Also the stone pouch is longer, and it's hard to tell, but it looks like a baby dot stone pouch snap. Anyone have any ideas what this sheath may be?
It's from a 1960 photo of Astronaut Mercury training photo.