Umpyo
A silver coin of Korea, issued in the nineteenth year of the Emperor Tai, i.e., A.D. 1882. It was circular in form, without the central square hole, and of three different denominations. Its minting ceased in 1883. It was also called Daidong Chun.
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)