Stamps and Covers of the World - Day 1

GRAN BRETAÑA. 1875(Sept 17th). Entire letter endorsed ´Via Panama´ to SALVADOR at 1s 6d rate for less than ½ ounce franked by 1875 6d grey plate 14 and 1s green plate 12 tied by London duplexes with manuscript ´4 reales´ due on front. SG 147,150.