1956 MAIL UXBRIDGE TO LONDON WITH 2D POSTAGE DUE VARIETY BISECTED. A fine window envelope from Uxbridge Middlesex, re-addressed to London, with Wilding 1½d cancelled UXBRIDGE MIDDLESEX 5 JUN 1956, postage underpaid with fine strike '1D/830' charge mark of Uxbridge in green. At left fine bisect of 2d postage due clearly tied by boxed cachet 'CHARGE NOT COLLECTED/FRESH LABEL REQUIRED'. Rare usage of postage due bisect. (Ref 118400).