Cook Islands

1980 Corals, IMPERFORATE Set of 24 Lower values MNH

6 se-tenant strips of 4 from the left margin of the sheet

On white gummed paper, Mint Never Hinged

Scott Catalogue: #564-9, Value US$2.65 (2009) for normal stamps

Plate Proofs or Imperforate are not listed

Stanley Gibbons Catalogue: #713-36, Value £7.20 (2013) for normal stamps

Plate Proofs or Imperforate are not listed

I believe these to be imperforate 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.