Large warships of the sort known as the Turtle ship or Geobukseon were employed by the Royal Korean Navy, most notably in the late 16th-century Imjin War with Japan.
This stamp, Scott No. 225, was created by Kang Bak, printed by lithography, and issued by (South) Korea on November 11, 1955 to honour the 10th anniversary of the Republic of Korea Navy. It features a statue of Korean naval commander and national hero Admiral Yi Sun-shin (1545–1598), the Korean Naval jack, and one of Yi's Turtle ships. It also includes a picture of a Turtle ship that has been rebuilt and is on display at the War Memorial Museum in Seoul