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Continue to ChatSummer Isles 1981 Clan Tartan - MacKenzie Se-tenant Pair (2v, 10p and 20p, U/M) https://www.grahamlandstamps.co.uk/shop/stamps/cinderellas/gb-offshore-islands/summer-isles/summer-isles-1981-clan-tartan-mackenzie-se-tenant-pair-2v-10p-and-20p-u-m/