Niue

1981 Flower definitives IMPERFORATE Set of 12 low values MNH

12 low values 2c to 25c

In se-tenant pairs from the bottom right corner of the sheet

On white gummed paper, Mint Never Hinged

Scott Catalogue: #317-322

Plate Proofs or Imperforate are not listed

Stanley Gibbons Catalogue: #381-392

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.