Royal Mail calls shade "Dark Pine Green". Stamp from pane of fifty. One elliptical hole in each vertical side. Broken U shaped slits. Source Code MBIL Date code M22L.
TOP RIGHT=SOURCE CODE Source codes may be seen in the words 'ROYALMAIL at the top right of the stamp.
The codes are: MAIL: Without a code letter this is a counter sheet
MBIL: z Business sheets MEIL: Standard booklet of eight
MFIL - standard booklet of four MPIL - Prestige booklet pane
LEFT OF FOREHEAD=YEAR CODE Date codes go from 21 (2021) to 23 (2023).
Backing Paper There is repeating undulating ‘ROYALMAIL’ background in two sizes of text printed on the front of the backing paper.
Types: - Alternate pairs of lines of the repeated ‘ROYALMAIL' inverted with each other. Large lettering above the small (Type PB-Ls)
- Alternate pairs of lines of the repeated ‘ROYALMAIL' inverted with each other. Small lettering above the Large (Type PB-sL) - At 90 degrees to the stamp design: the pairs of lines can appear with the Large lettering before (as opposed to over) the small (Type PB(L)-Ls), or with the small before the
- Large (Type PB(L)-sL). Print: International Security Printers Ltd.
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