Here we have a few more 20 year codes and a couple of variations for the 1st Class red shade and its thinning backing paper.
M20L MTIL Much thinner backing paper
M20L MCIL Deeper red Queen's head from Sherlock book, also thin backing paper with very bright fluorescence
2p Dark Green with M20L MAIL
20p Bright green with M20L MAIL
M20L MBIL very bright fluor with a yellow tint
