1872 GB USED IN PERU ON COVER. Envelope Callao to London with 1d pale green Peruvian issue paying local postage, with GB 2d blue plate 14 (SG47) lettered CB, 4d vermilion pl.12 (SG94) lettered KB and 1s green pl.5 (SG117) lettered RB, tied two good strikes of the 'C38' barred numeral of Callao. On reverse CALLAO date stamp SP 14 72. Fine example of the GB post office in Peru. (Ref 114311).