Great Britain 1970 5d-1s9d Anniversaries, events described on stamps, SG823a.
Very fine used cover bearing a 1s9d with lemon (trousers and document) omitted, neatly tied to an illustrated first day cover by a London W.C./First Day of Issue circular date stamp for AP.1.1970.
A scarce error. Pierron records only 3 examples used on First Day Covers.
Accompanied with a 2012 British Philatelic Association (BPA) Certificate of Authenticity.