G.R. gun part...But what part?

[mk4125]

G.R. Patent 'Keyhole cover'

. Found this amongst some fur trade items.. (discovered after that it's a 'keyhole' cover and not a gun part).

 

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[Ia.FurTrade]

Yep! George III era padlock keyhole cover.....Nice find!

Iowa Dale

 

[Charlie P. (NY)]

G.R. stands for Georges Rex; Latin for King George