26c on 29c black 'Provisional' SURCHARGE issue TRIAL OVERPRINT on vertical pair with top stamp overprinted in black and bottom stamp overprinted in GREEN, fine mint. Rare & unusual. (As SG 717)
26c on 29c black 'Provisional' SURCHARGE issue TRIAL OVERPRINT on vertical pair with top stamp overprinted in black and bottom stamp overprinted in GREEN, fine mint. Rare & unusual. (As SG 717)