DP8 - The First (Later Rejected) Die for the One Penny Stamp - reprinted 1840-1935
The die was engraved by Charles Heath and his son Frederick in Jan 1840.
The First (Later Rejected) Die for the One Penny Stamp with “POSTAGE ONE PENNY” at foot, a reprinted die proof in yellow green on unwatermarked cream wove paper (66 x 70mm),
The die in its final form remained with Perkins, Bacon & Co. and reprints were made from time to time (1840-1935).
Source Grosvener Philatelic Auctions
see also British Postal Museum from the R M Phillips Collection. Vol XXI Pg 47 and Vol XXI Pg 48.