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Continue to ChatStroma 1968 Mexico Olympics Imperforate Sheetlet (2v, 2s6d and 7s6d, U/M) https://www.grahamlandstamps.co.uk/shop/stamps/cinderellas/gb-offshore-islands/stroma/stroma-1968-mexico-olympics-imperforate-sheetlet-2v-2s6d-and-7s6d-u-m/