15c Brown & Blue, Ty. III, Plate Proof on Card, Plett Type 3 "Specimen" Blue Handstamped Overprint (129P4-S). Huge margins, with blue "Specimen" applied inverted at bottom right, bright colors, Very Fine, this is the only recorded example of this type of "Specimen" on the 15c 1869, 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 the "Specimen" handstamp (see Chronicle 227 for article by Michael Plett), with 2010 P.F. certificate stating this is a genuine Plett Type 3 "Specimen"

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