GREAT BRITAIN 1980 STAMP EXHIBITION DOUBLE-DATED COVER, LONDON SW
Illustrated cover featuring 50p International Stamp Exhibition, London single with LONDON SW special cancel dated 9 APRIL 1980, the first day of issue of the sheet printing, and miniature sheet with similar cancel dated 7 MAY 1980, the first day of issue of the miniature sheet. Scarce double-dated cover. Fresh and fine. SG1118Ea; SGMS1119; SC909/a; BC204r
