Tosa was a lords domain on the island of Shikoku in Japan and it issued many
of its own coins between 1866-71.
Tosa Tsuuhou coins were modeled after the Tenpou Tsuuhou 100 Mon coin. Tosa also minted a large rectangular coin called a Tosa Kanken which had on its obverse side 100 mon as its value. Its monme coins (units of 1 and 10) are all round.
Tosa is present day Kochi prefecture.
Coin images provided by Luke Roberts (book Zuroku Nihon no kahei, vol. 4., published by Touyou keizai shinpousha, 1973).
Chinese Coinage Web Site