St Lucia 1967 QEII Postage Due Statehood Black Overprint 16c Pair UM Mint Trial?

Queen Elizabeth II Postage Due Statehood overprint 16c pair mint. Overprinted in black which was noted as a trial surcharge - am very unsure on the status of these. Unmounted mint.
Year : 1967
Reign : Queen Elizabeth II
Catalogue No : SG footnote
Condition : Unmounted Mint
Price : highest bid
St Lucia 1967 QEII Postage Due Statehood Black Overprint 16c Pair UM Mint Trial?St Lucia 1967 QEII Postage Due Statehood Black Overprint 16c Pair UM Mint Trial?

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