2c-60c on 1c-30c Offices in China (K1-K14).
Three registered covers, each addressed to The Society of Chemical Industry in Basle, Switzerland,
first with Nos. K1-K6 tied by oval "U.S. Postal Agency * Shanghai China" handstamps, Jul. 23, 1920 datestamp, New York transit and receiving backstamps, second cover with Nos. K7-K13 and third with No. K14, all similarly tied and used, are fresh and Very Fine, an attractive trio of covers
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