EDO PERIOD SILVER COINAGE
Crudley made average 98.71% silver
westerners were impressed a ta recangluar shape coin that has hallmark stamp but japan switched over to round coins after western influence
this coin weighs 1.92 grams and image of exact coin

In the 17^Th centaury bronze coins were minted

These had standard size and weight controlled by ruling Shogun

These coins were high standard as previous century coins were not standard and caused economic chaos.

Late 17^th century the  silver character mon was added, a unit of currency was added to the back of kan’ie tsuho coin and standard size was over seen by the Bakufu in the Kameido part of Edo