for "British", with the relief mark of a pin where the missing letters should be, fresh unused with large part original gum. Extremely rare. B.P.A. Certificate (1990). S.G. 85a, £1200. Photo" /> unused -- 7½a. mauve and red showing variety<I> "Bri"</I> for<I> "British"</I>, with the relief mark of a pin where the missing letters should be, fresh unused with large part original gum. Extremely rare. B.P.A. Certificate (1990). S.G. 85a, £1200. Photo | Christie's