GUYANA 1981 (MNH) $15/$1 PARCEL POST OFFICIAL WITH BLACK 'OPS' OVERPRINT
$1 Chelonanthus Uliginoides surcharged '$15,00' and overprinted 'PARCEL POST'. Further overprinted 'OPS' in black (normally red). Scarce. Fresh and fine. Mint never hinged. SGOP1a; SCQO1var
