1943 AIR MAIL TANGIER TO QUITO, ECUADOR WITH KGVI 2/6 YELLOW-GREEN (SG476b). Fine air mail envelope from Tangier to Quito, Ecuador with KGVI 6d purple (SG470) and fine 2/6 yellow-green (SG476b) cancelled fine strike 'REGISTERED/BRITISH P.O. TANGIER' oval date stamp 1 AU 43. On reverse New York and Ecuador date stamps. Unusual usage. (Ref 139977).
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