12c Green, Plate Proof on Card, Plett Ty. 3 Blue "Specimen" Handstamped Ovpt. (117P4-S). With blue 10.5mm serif "Specimen" overprint applied reading down at left, brilliant color, large margins to full at left, Very Fine, this is the only recorded example of this type of "Specimen" overprint on the 12c 1869, according to research by Michael Plett, in the late 1870's and early 1880's the Post Office Department responded to requests for samples by sending out some of the card proofs that were available, in four recorded instances the receiving country applied a "Specimen" handstamp, in four different types (see Chronicle 227 for Plett article), with 1990 P.S.E. certificate stating "Genuine, Specimen overprint of unknown origin" (issued before the Plett research)

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