Transition letter. Letter from Christiansted during the transition period 1.4.1917 - 30.9.1917 to Skive, Denmark. US 15 cent stamp tied by US datestamp 'CHRISTINASTED SEP 8 1917 / SAINT CROIX'. 5 Cents equals 25 BIT UPU single letter rate, plus 10 US cents registration fee = 15 Cents total postage, only recorded single franking US 15 cents from DWI during the transition perioed. British re-sealing tape 'OPENED BY CENSOR. / 181'. On reverse the rare 'CHRISTIANSTED SAINT CROIX / REGISTERED / SEP 8 1917' from the transition period and NY Registered marks and Skive reception mark 10 Novemmber 1917.