2021년 10월 게르트너 옥션에 출품. 경매 시작가 5000유로. Korea: 1899 (ca.), the extremely rare set of lithographed Essays: 5 P. green, 10 P. blue and the esp 1899 (ca.), the extremely rare set of lithographed Essays: 5 P. green, 10 P. blue and the especially scarce 20 P. red. In perforation 10, in Poon-currency, inscribed "IMPERIAL KOREA". These designs were largely applied to the 1900/01 Ewha series resp. the 190..
