"W.A. Cooper" envelope registered to San Francisco, showing Rarotonga c.d.s., manuscript registration markings and, on reverse, large "GOVERNMENT OF THE COOK ISLANDS." cachet and Wellington transit c.d.s.; some very minor fox marks. Photo" /> cover -- 1d. to 10d. set of four each cancelled by violet "RAROTONGA" in oval of bars on 1893 (Jan.)<I> "W.A. Cooper"</I> envelope registered to San Francisco, showing Rarotonga c.d.s., manuscript registration markings and, on reverse, large "GOVERNMENT OF THE COOK ISLANDS." cachet and Wellington transit c.d.s.; some very minor fox marks. Photo | Christie's