Die proof is made from the original die (i.e., single stamp image, typically attached to a larger sheet of card and showing sinkage from the die block). Plate proof is made from the finished stamp plate. You probably have a plate proof showing part of a sheet margin at left.
Plate proofs are smaller and cut from a large proof sheet taken from a printing plate. Die proofs are larger and single taken from a printing die. Yours looks like a plate proof.
The original dies and plate of the Prince Edward Island were acquired by the Royal Philatelic Society , London and used to illustrate an article by Tilleard in the London Philatelist. The 6d. die was not discovered until World War II. In 1962 H. R. Harmer (New York) reprinted proofs from the 6d. in ten colors on a cream glazed card for distribution as Christmas Greetings. Wert, the proof you showed is one of these.
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