An Olympic medal held by a Tokyo museum and thought to be the first won by a Japanese athlete was recently discovered to be from a different event at the same games, meaning the location of Japan's first medal, won by tennis player Ichiya Kumagai, is unknown.

The Prince Chichibu Memorial Sports Museum and Library has concluded that the silver medal from the 1920 Games in its collection is not Kumagai's won in the men's singles, rather it is that of Kumagai's doubles partner Seiichiro Kashio, museum officials said.

The pair won the silver in the doubles event at the same games, but after Kumagai claimed the singles medal, the museum said.