Lot 80190 – 1889-1911 Travancore anchal conch shell issues officla

1889-1911 Travancore Cochin conch shell issues official overprints and postage stamps study material in a stockbook. A deep study material looking into, perforations, watermark, shades, paper varieties. Excellent research material for the specialist. Mixed condition expected but generally fine (SG £ 1000+).