Stamps and Postal History of Spain, featuring China, Colombia – Prephilatelic Spanish period –, British Colonies, Japan, Portugal and Switzerland

NIGERIA. 1895 (8 May). OHMS envelope (221x95 mm.) registered to SAN FRANCISCO, bearing 1894 (Jan.) 2d. (2) and 1894 (May) 1/2d. (4), each clearly cancelled by OLD CALABAR RIVER c.d.s. with code A (Type D2), showing OLD CALABAR squared-circle d.s. with code D (Type 4) and REGISTERED/OLD CALABAR RIVER oval d.s. with code C (Type R6) alongside and large R h.s. (Type R1) with, on reverse, New York and arrival (27.6) datestamps. RARE with these code letters.