SG 251a 9d Slate Purple & Ultramarine (OCP) M40 (-) in very fine and fresh mounted mint condition with pretty standard section of very clean and fresh hinge top remains to upper reverse.

One of the values printed by De La Rue initially on this thinner chalk coated paper that quickly gave way to the thicker full chalk coated canvas more generally seen and recognised.

A lovely fresh example here with added value and appeal from near perfect centring and very clear OCP 'characteristics' under standard, magnified and long wave UV inspection that all have gone through here at UKGBSTAMPS at least.