cover 1866 (23 Jan.) entire letter from Hamilton "Via Halifax Per Mail" to London, marked "Registered" and with various rate computations in red crayon, showing fine P5 c.d.s. (crossed by filing crease), "Crown/REGISTERED" and London Registered oval d.s., both in red; two stamps, a 6d. and 1/-, have been removed, probably when it was decided to register the cover