A round one Yen gold coin from Japan should be 12mm or 13.5mm and weigh about 1.67grams.
It should be dated in the 1870s to 1880s.
If it is gold, then someone may have been hobbying with a home electroplating kit.
It should be dated in the 1870s to 1880s.
If it is gold, then someone may have been hobbying with a home electroplating kit.























