£250 - £300
GB 1912-24 2½d dull Prussian blue used on small piece tied by 'British P.O. Constantinople
1912-24 Royal Cypher 2½d dull Prussian blue used on small piece tied by 'British P.O. Constantinople' double-ring ds. Very fine. RPS Certificate (2025). SG 373a, Spec N21 (17
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