13 September 2018 - World War I Centenary prestige stamp book
The final WWI commemorative PSB is issued in 2018. The definitive pane contains 4 x 1st class Poppy stamps and 4 x 1st class Machin definitives, coded M18L MPIL. As with previous litho printings, the iridescent printing is not as clear as in the gravure printed booklet and sheet stamps, but the P is definitely present on this stamp.
This 1st class is in deep scarlet or (Gibbons) bright scarlet.
This is a single 1st class stamp