4 December 2018 - Harry Potter PSB
For no obvious reason, Royal Mail issued a series of stamp products featuring the film series 'Harry Potter'.
The Machin definitive pane from the PSB contains 2x 1p, 2x 20p, 2 x 50p and 2x £1.25 stamps.
This is a set of 4 Machin definitives coded M18L MPIL. The iridescent printing is easier to see than on the RAF PSB earlier this year.
The 1p, as often before, reacts under ultra-violet light and shows yellowish-orange.
Norvic numbers: 4001P.8, 4020P.8, 4050P.8, and 4125P.8