Booklet of 4 x 1st class Large deep scarlet with year code M17L and source code MFIL
Re-printed by Walsall Security Printers in 2017 and packed 05/04/17
The cylinder numbers are unchanged: W3 (deep scarlet) W1 (iridescent) W2 (phosphor). The cylinder numbers are obscured by the front cover when the booklet is closed (see image).
Expected to be SG RB6