SG 251a 9d Slate Purple & Deep Ultramarine OCP M40 (-) unlisted shade printed on the early thin coated chalk paper where two shades have been listed in Hendon's 2010 publication.

Here offered in lightly mounted mint condition with light hinge top remains though sadly has heavy reverse gum bend and frontal light crease running up through centre of stamp.

Though actually much scarcer than the two Hendon listed shades I have not applied any premium for this though have heavily discounted to reflect the condition as should always be the case. Offered here at well under a quarter of the listed retail.