OSS Beano grenade on Pawn Stars

I was surprised to see an OSS “Beano” grenade last night on Pawn Stars on the History channel. They guy who brought it in had paid $5.00 for it, and was able to sell it for $1600.00!

http://www.inert-ord.net/usa03a/usa3/t13/index.html

How did they come up with “T13”?

The first version was T12, and…

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