Great Britain 1864 1/- deep green Victoria Bath to USA Double Rate Cover

Cover franked with 1/- deep green Victoria (SG 89, Plate 1), tied to cover by Bath 53 duplex (Feb 9), to Philadelphia, United States, red handstruck "48" and a red manuscript "42" indicating the British share of the postage for overseas delivery, London c.d.s. transit backstamp, the stamps with lovely colour, an exceptional quality cover.