12 October 2017 - 1st class deep scarlet Machin definitive.
The original stamp on SBP1 was issued in the Windsor Castle and David Bowie Booklets in the spring of 2017.
The next mixed booklets are the two Star Wars booklets, one of which has backing paper inverted compared with the other, see blog:
If you would like examples of both, please order 2 and make a note in 'Additional Information'.
SG number U2968ba - new number for new shade.
The first MCIL coded booklet this year is 2936aC.7, so this one is 2936aC.7a.
Both Booklets also available