Cook Islands

1973 Q.E.II Coronation 20^th Anniversary, IMPERFORATE 50c M/S MNH

On white gummed paper, Mint Never Hinged

Scott Catalogue: #350, Value US$3.50 (2009) for normal M/S

Plate Proofs or Imperforate are not listed

Stanley Gibbons Catalogue: #MS430, Value £2.50 (2013) for normal M/S

Plate Proofs or Imperforate are not listed

I believe these to be imperforate Plate Proof. 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.