Penrhyn (Cook Islands)
1974 Definitives, IMPERFORATE $2 & $5 MNH
Matched Singles from the bottom left corner of the sheet
On white gummed paper, Mint Never Hinged
Topic: Aerial view of island and islands location on a globe
Stanley Gibbons Catalogue: #68-9, Value £6 (2013) for normal stamps
Plate Proofs or Imperforate are not listed
Scott Catalogue: #62-3, Value US$16.25 (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.