This is a selection of 8 different Machin barcoded or data matrix security definitives with the year codes 21 and 22.

The blue 2nd class NVI has date code M21L and source code MBIL. 

The 3 green 2nd class NVIs all have the year code M22L, and source codes MAIL, MBIL, and MEIL respectively.

The 4 plum 1st class NVIs all have the year code M22L, and source codes MAIL, MBIL, MEIL, and MFIL respectively.

They are all postally used and on paper - see photos.

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