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Continue to ChatDhufar 1972 Star Tortoise Sheetlet (50b, CTO) https://www.grahamlandstamps.co.uk/shop/stamps/cinderellas/overseas-territories/dhufar/dhufar-1972-star-tortoise-sheetlet-50b-cto/
Dhufar 1972 Star Tortoise Sheetlet (50b, CTO) https://www.grahamlandstamps.co.uk/shop/stamps/cinderellas/overseas-territories/dhufar/dhufar-1972-star-tortoise-sheetlet-50b-cto/