GR is an an abbreviation for King George in Latin. The coin is something that someone put in on a whim. Adds no value except conversation piece. You have a well worn looking WW1 SMLE rifle and perhaps if the bore is nice it can be a shooter. Some collector value but it ain't gonna make your new car payment.
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Your gun is like your nose, it is just wrong for someone else to pick it for you!
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