Detecting at the beach (Pics)

[Coins4Cheese]

I went detecting at Enoshima beach today, which is in Japan. I found acouple 10 yen coins, two 1 yen coins, and the find that made my day, an old Japanese coin called "Kuan-ei-tsu-ho" in very good condition. My guess is that it was made probably in the 18th century, but it beats me why it's in such good condition.

 

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[OldNorthwest]

That's a nice coin, good work!

I've always wondered, are there many older silver coins to be found in Japan?

 

[allen]

What type of material is that coin made out of ?