Korean Yen

The Korean Yen was the currency of Korea between 1910 and 1945. It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. The yen was subdivided into 100 sen. It replaced the Korean won at par and was replaced by the South Korean won at par, and the North Korean won.

Banknotes
From 1902-1910, banknotes were issued by Dai Ichi Ginko (First National Bank of Japan), 株式會社第一銀行, Kabushiki Gaisha Daiichi Ginkō). Denominations included 10 sen, 20 sen, 50 sen, 1 yen, 5 yen, and 10 yen. The sen notes were vertical and resembled the Japanese sen notes of 1872 and the Japanese Military Yen at the turn of the century. These notes were redeemable in "Japanese Currency at any of its Branches in Corea"

In 1909, the Bank of Korea (韓國銀行, Hanguk Eunhaeng) was founded in  Seoul as a central bank and began issuing currency of modern type. Bank of Korea notes were dated 1909 and issued in 1910 and 1911. After Korea lost her sovereignty to Japan in 1910, the Bank of Korea was renamed the Bank of Choson (朝鮮銀行, Korean: Joseon Eunhaeng, Japanese: Chōsen Ginkō). The first Bank of Choson note was dated 1911 and issued in 1914. 1 yen, 5 yen, 10 yen, and 100 yen were issued regularly, while there were occasionally some sen notes (5, 10, 20, 50 sen). 1000 yen was printed but never issued at the end of World War II. The earlier issues were redeemable "in Gold or Nippon Ginko Note". A similar phrase was written in Japanese on later issues.