6 Pence light orange-brown, Queen Victoria, white corner letters on coloured ground, letterpress De La Rue, comb perforated K14, plate 11, two horizontal pairs "FF-FG" and "HB-HC" and single "RD" from slightly differently shaded sheet, single-circle "LONDON SP 3 72" and duplex "87" cancellations on complete folded letter to Porto, Portugal via France. Arrival "PORTO 8 9 1872" on reverse, pair HB-HC with minimal perforation faults at lower left, single RD beside it with perforations cut at right, otherwise perfect condition. 2sh/6d for closed letter up to 1 1/4 ounces (5th weight step) via France to Portugal, paid to destination, red circled "PD" and Portuguese "FRANCA" oval confirmation in brown-black. Rare high rate from Martinez Gassiot & Co. correspondence to Porto, photo certificate Albert Louis BPP (2023) "genuine and in a fresh state of preservation", Mi. 500.-+ (SGNo. 122a), ex David Brown collection.