IMPERFORATE STAMPS OR PLATE PROOFS on STAMP PAPER

The question has arisen over the years as to whether these are "imperforates for proofs on Stamp paper". They can be found as horizontal or vertical pairs, with or without gum and in two denominations, 30¢ and 50¢. It is possible they are actually colour plate proofs printed on stamp paper by the "proofer" to accompany the die proofs.

30¢ & 50¢ imperforate pairs with gum (very rare)

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