Penrhyn (Cook Islands)

1985 Queen Mother Life & Times, IMPERFORATE Set of 4

Singles from top left of sheet

On white gummed paper, Mint Never Hinged

Stanley Gibbons Catalogue: #378-81, Value £2.80 (2013) for normal stamps

Plate Proofs or Imperforate are not listed

Scott Catalogue: #319-22, Value US$5 value (2009) for normal stamps

Plate Proofs or Imperforate are not listed

I believe these to be Plate Proofs. The printer of this stamp issue Fournier S.A sold its philatelic archives of stamp artwork and proofs in 2007 through the German stamp dealer and auction house Gärtner.