Silver Bowling

How I can determine the age of my money?
I have 2 cups of silver, which are Japanese and the imperial seal on them. I found no information on the Japanese money and I want to know, "How I can determine the age of my money?".
Go to an antique store that specializes dishes. To my knowledge there is no test for age. You have until the date of stamping.
Asian Youth Games: Park Ji Soo from Korea, SILVER, Boys’ Bowling Singles
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