C1 variety, CSS 1451a, "Inverted Surcharge" 1949 Silver Yuan Hunan surcharge, Domestic Air Mail on $40,000 green on SYS Shanghai Dah Tung print

C1 variety, CSS 1451a, "Inverted Surcharge" 1949 Silver Yuan Hunan surcharge, Domestic Air Mail on $40,000 green on SYS Shanghai Dah Tung print