Cook Islands
1986 Return of Halley’s Comet, IMPERFORATE Set of 5 MNH
Set of matched singles from the top margin of the sheet
On white gummed paper, Mint Never Hinged
Scott Catalogue: #897-901, Value US$15 (2009) for normal stamps
Plate Proofs or Imperforate are not listed
Stanley Gibbons Catalogue: #1058-62, Value £10.60 (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.