2003 (02) DNA - Cambridge Official - Only 20 Exist!

Lovely Cambridge 'Double Helix' Official - This is the cover they used for the Prestige Stamp Book, but at the last minute, they applied the stamps to 20 of these covers.

The 'Standard' cover for the stamps issue has a similar image, but it's larger with red text and an additional photograph of the Cavendish Laboratory on it.......

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