D13 1924-31 George V 2d Agate Postage Due Watermark Block Cypher C 25 Control block of six in Post Office fresh unmounted mint condition.

Like every stamp I sell these has been fully checked and confirmed by myself as correctly identified and described, not just removed from album where it was listed as such.

That said, the control of course also guarantees on these issues the actual printers and issue. The grade is with my personal guarantee and means of course that both the stamp and the all important selvedge control free of any mounting, marks or blemish.