cover 1892 (3 Sept.) 6d. Registered Letter U5 (H & G 3 - size H2) to Boston, U.S.A., bearing 1886 perf. 12½ 2d. and 1892 6d. tied by Nukualofa duplex, showing Apia registration label with, on reverse Apia and San Francisco transit c.d.s. Rare and attractive. Photo