1p maroon Machin definitive from counter sheets
The stamp was printed by ISP Walsall with year code M18L 09/05/18 with blue phosphor, and distributed by Royal Mail Tallents House on 12/09/18 at the same time as the earlier printing. On this printing the transparent iridescent ink with the words ROYAL MAIL has yellow fluorescence.
SG U2920 - same number used for previous years
Cylinder blocks of 6
Date blocks of 8 - 09/05/18