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Continue to ChatCarn Iar (Summer Isles) 1961 Birds and St Columba (1s - single value, U/M) https://www.grahamlandstamps.co.uk/shop/stamps/cinderellas/gb-offshore-islands/summer-isles/carn-iar-summer-isles-1961-birds-and-st-columba-1s-single-value-u-m/