cover 1866 (27 Mar.) entire letter to Calcutta bearing 1a. brown tied by manuscript "stamped" and the very rare Singapore "172" duplex and showing, on reverse, arrival Ship Letter and G.P.O. datestamps in blue-green; a little worn along folds and with some blue-green ink offset on face panel. Very rare, only about four covers recorded. Photo

Details
cover 1866 (27 Mar.) entire letter to Calcutta bearing 1a. brown tied by manuscript "stamped" and the very rare Singapore "172" duplex and showing, on reverse, arrival Ship Letter and G.P.O. datestamps in blue-green; a little worn along folds and with some blue-green ink offset on face panel. Very rare, only about four covers recorded. Photo