This is a copper 1/2 sen coin from Japan, dated 1886, which features the Meiji emperor, who ruled from 1868-1912. The coin was minted in the 19th year of his reign, which corresponds to 1886. The denomination, "1/2 sen," is inscribed in Japanese characters on the reverse side. While the metal in the coin may not be particularly valuable, it is a fascinating piece of history from a tumultuous period in Japan's past, which saw the country rapidly modernize and become a major player in world affairs.

Issuer	Japan
Emperor	Meiji (1867-1912)
Type	Standard circulation coin
Years	6-25 (1873-1892)
Calendar	Japanese - Meiji era
Value	½ Sen (0.005 JPY)
Currency	Yen (1871-date)
Composition	Copper
Weight	3.56 g
Diameter	22.2 mm
Thickness	1.3 mm