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Continue to ChatGuernsey-Sark Commodore Shipping 1965 1s3d Definitive Overprinted for 1971 GB Postal Strike (U/M) https://www.grahamlandstamps.co.uk/shop/stamps/cinderellas/gb-offshore-islands/sark/guernsey-sark-commodore-shipping-1965-1s3d-definitive-overprinted-for-1971-gb-postal-strike-u-m/