1,2) Historically very important year of 1981 Korean 1000 Won

1981 in South Korean history marked the beginning of the Fifth Republic under President Chun Doo-hwan (1981–1988), characterized by authoritarian military rule following the 1979 coup and 1980 Gwangju crackdown. A new constitution was adopted in March 1981, enabling a 7-year single-term presidency, and the "Seoul Spring" protests were suppressed.

Key events in 1981 included:

Political Consolidation: The Fifth Republic officially launched on February 25, 1981. The Democratic Justice Party, led by Chun, won a legislative majority in March 1981 elections, which were held under tight control with key opposition figures barred.

International Recognition: On September 30, 1981, Seoul was selected as the host city for the 1988 Summer Olympics, a major international milestone.

Infrastructure & Media: The 88 Olympic Expressway (connecting Daegu and Gwangju) began construction in October 1981. Commercial advertising began on KBS 2TV, and the Seoul Metropolitan Subway Corporation was established.

3) Japanese Kan'ei Tsūhō copper cash coin from the Edo period. These coins were manufactured in Japan from 1626 until 1868. 

4)  Japanese 5 Sen coin from the Shōwa era (likely 1940-1942), produced during World War II. 

5)  1933-1938 Japanese Nickel 5 Sen Coin. Showa Era Mintage With Nationalist Themes. 5 Sen, Monetized By Government Of Japan.

6) 100 Korean Won

The date is listed as 4292 according to the Dangun calendar, which corresponds to 1959.

• It is made of a copper-nickel composition.

This coin was withdrawn from circulation in 1962.