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2nd class blue Machin security stamp Business Sheet with source code MBIL and year code M18L with Security Backing Paper type 2
The 2nd class business sheet was reprinted on 14/03/18 and first appeared in April 2018.
This printing has the repeated text ROYAL MAIL on the backing paper beneath the stamps of a new type, with alternate pairs of lines of text inverted.
SG U3030 - previously U2961 (also used for earlier years).