2017 marks the 50th anniversary of the issue of new Queen Elizabeth II definitives featuring Arnold Machin's iconic bas-relief sculpture which replaced the Wilding definitives. Arnold Machin's 1967 portrait of Queen Elizabeth II (sometimes referred to as the Machin head) has been reproduced over 200 billion times.
Royal Mail issued two miniature sheets and a prestige stamp booklet (PSB).
The Prestige Stamp book contains two panes of Machin definitive stamps in various guises.
Pane 4 has a selection of 1st class values and two examples of the 20p Penny Black Anniversary stamps.
So, in order, the 1st class are:
black - orange - gold - millennium - PIP - Royal Mail red security
Only the 1st class red - which is the original red, rather than the newer dark red (or bright/deep scarlet) has an iridescent security overlay, in exactly the same place as on pane 3, suggesting that the same cylinder was used. The two 20p stamps are in the central positions in the upper and lower rows.
All have elliptical perforations and two phosphor bands. The stamps are printed in gravure by ISP (Walsall). As with pane 3, the Stanley Gibbons' catalogue editors regard most of these stamps as being previously issues. The exceptions are the 1st class red with 2017 coding, and the 20p Penny Black stamp which has elliptical perforations for the first time. (There was a version with elliptical perforations in the 'Treasures of the Archive' PSB issued in 2009, but this printed by Cartor in litho and the current one is gravure.)
Again, the head on some is quite whiter than many previous gummed elliptical gravure versions.
Block of 8 stamps (7 different) and one label.