20 October 2016 Booklet of 4 x 1st class Large deep scarlet with year code M16L and source code MFIL
Printed by Walsall Security Printers
Royal Mail's rebranding resulted in the booklet being produced with a new, Chevin, font and with the stamps printed in what Gibbons describe as Deep Scarlet.
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