Cook Islands

1980 3rd South Pacific Festival of Arts IMPERFORATE Set of 16 in blocks of 4

On white gummed paper, Mint Never Hinged

Scott 192-207, $4.55 for a normal set of 16, Plate Proofs or Imperforate are not listed

Stanley Gibbons Catalogue: #291-306, 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.