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1st class Large from booklet of 4, 2015 version M15L MFIL.
The 2015 version of the booklet appeared at the end of March 2015
SG U2974 (also used for earlier years).
At the beginning of February 2016 booklets were found with the new printed backing paper. These have the 2015 year code O15R. Future printings in 2016 have the O16R year code. Some booklets are also available.