(British Post Offices) 1873 (July 26) mourning outer letter sheet to Cadiz franked Great Britain 1867 10d. red-brown in horizontal strip of three, CF-CH, paying a triple rate tied by two strikes of ‘C61’ obliterators in black, light Porto-Rico/ Paid cds in red, London Paid cds and oval PD, red crayon “4” on front, reverse with Madrid transit and Cadiz arrival cds (Aug 18). Rare and attractive. Ex H. Wood