Bermuda 1951 10/- shades
Supplied by A.Cole
One scan shows the reverse of my 5s '51 ptg blue-green (with a hinge remnant) together with a regular green '51 ptg.

The other scan shows the front of the blue green flanked by a regular '51 & '53 ptgs. Even on the front you can see the difference, but it is much more noticeable looking at the backs.

10sbluegreen

bluegreen