Great Britain 1952 1s Bistre-Brown "Wilding" (wmk Tudor Crown), SG529var Art Accompanied with a British Philatelic

Accompanied with a British Philatelic Association (BPA) certificate of authenticity (2002)

error magenta omitted (leaving the sky blue instead of violet

test pilot and university professor

who carefully selected aircrew from Britain

raised rim surrounding with incuse legend both

Great Britain 1952 1s Bistre-Brown "Wilding" (wmk Tudor Crown), SG529var Art Accompanied with a British PhilatelicGreat Britain 1952 1s Bistre Brown "Wilding" (wmk Tudor Crown), SG529var Superb unmounted o. g. block of four imperforate imprimaturs with "NPM IMPRIMATUR" handstamps on reverse. Very rare. ALERT ME WHEN ANOTHER IS AVAILABLE > SELL ONE OF THESE >