24c Green & Violet, Plate Proof on Card, Plett Type 3 "Specimen" Blue Handstamped Overprint (120P4-S). Large margins, bright colors, with blue "Specimen" applied inverted at top center, Very Fine, this is the only recorded example of this type of "Specimen" on the 24c 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 "the handstamp in 'Chessylite Blue' according to Clarence Brazer"

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