cover 1917 (21 Feb.) "CHINA" 10c. registered envelope (size K) to U.S.A. and bearing an additional pair of 20c. (another adhesive is missing) tied by Hoihow c.d.s. and bears a fine strike of boxed registered "HOIHOW B.P.O." h.s.; with large part "INSURED" label; a few faults, mainly confined to the reverse, scarce. Photo