cover -- 30 cash. blue on XU5 to Swatow, cancelled by "FORMOSAN REPUBLIC/TAIWAN" double-ringed d.s., showing tablet type Swatow Steamer Letter Office h.s. in red adjacent and similar Steamer office h.s. for Amoy on reverse. A rare private letter usage for this short-lived period of the Black Flag Republic. S.G. R4, Chan F41. Photo