£220
RARE 1st-MONTH USAGE OF THE 1st-TYPE UNNAMED "GREENOCK & ARDRISHAIG PACKET/B/163" DUPLEX; 9 July 1879 usage of 1d pink embossed p. stat. env. (minor faults not affecting cancel) from "TIGHNABRUAICH" (thimble cds on back) to London (red receiving cds on back) cancelled by remarkably very fine rare GAP1 "B"-code (return afternoon voyage) Duplex; the first month of recorded usage. Few known; Important Exhibition Item. [Similar 6 Aug. 1879 cover in Cavendish's 11 Sept. 1999 'Ecosse' auction sold for £632].
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