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1st class Large red Machin security definitive business sheet 2016, with Security Backing Paper.
This is a 1st class Large letter business sheet stamp coded M16L with Security Backing Paper, printed 11/02/16, first available in late July 2016.
Royal Mail have said that booklets and business sheets will be reissued in October 2016 with a new corporate ID, so the print run for these might be low, if replacement is due soon.
SG U2973 (also used for other years)