That's just strange. I also don't see a Randall stamp anywhere on the sheath. Perhaps one of the other Randall "experts" out there can help. It's a really nice looking model 13-6 with a forward curved hilt. As for the Randall stamp, it looks like it could have happen when they were grinding and polishing the blade.

Dan Snyder
RKS #5537
SHAG #010
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It's best to remain silent and thought a fool than to speak up and be proven so!