CHEFOO: 1901 Postcard to France with « KITAI » 1k and 3k tied by Chefoo 15.7.01 (Gregorian calendar) cds in violet (T&S type 1), with different strike of the Chefoo 2.7.01 (Julian calendar) cds in violet (T&S type 2), France arrival, attractive cover showing use of different date-stamps for the two calendars Note: Russia did not adopt the Gregorian calendar until early in 1918. In the meantime, Russian P.O.s in China frequently used two ds to express the date in both calendars, the Julian calendar being 13 days behind the Gregorian in the 20th Century.