GB Machin SG Y1689a | TCM E28 25p Rose-red 2B (1993) Harrison Imperf Strip with Yellow Phosphor U/M (Very Rare)

25p Rose-red 2B (1993) Harrison Imperf Strip with Yellow Phosphor The Complete Machin Catalogue number TCM E28. Horizontal strip of 3 with the left pair completely imperf and the right stamp partially imperf. This item was part of a large estate of Machin stamps. It was originally purchased from B. Alan Ltd., a well-known dealer in the UK for 50 years. Its owner, James Skinner, was also editor of the Connoisseur Catalogue of Machin Stamps, the “go to” catalogue for decades. The collector purchased this item between 1990-2006 where it remained until 2025. Provenance in the form of the original invoice or price list from B. Allan Ltd. describing the item is provided.