Early Japanese Silver Coin

Rayner Graham was the Colonel in US Army..He bought this from possibly Jack Orend. The guy on the ANACS papered Oban.

His daughter sold his coin collection at auction 6-7 years ago at a small non-online auction in Ohio. I was phone bidder and paid a few grand for all of them. The last one declared not genuine was:

Hakata Gokoyo Gin circa AD 593 or 1593..Curiously this copy has Terbium metal in the silver like the others and the mine was shut down in 19th century and thus this was made before the mine shut down or somebody of the period was making forgeries and passing them off as real...i will upload the pic of this later.

I believe the other one I uploaded to be genuine because it runs at least 50%+ silver and silver oxide has grown into the lacquer coating...I bought these off pure "gut instinct" w/o prior knowledge

X-ray analysis of material note higher copper content, Silver and Terbium rare Earth..trace gold and other elements. This is about 60% + silver content by weight. The first silver smelted from the mines in late 16th century had lower silver content as you can see the spectrum. By early 17th century the silver content went up to 90% by weight based on advanced techniques.