Quote:
using them can carry a risk..
I hope the sorting machine has still the tuning instruction in!
But some recent experience, for example the David Gentleman revivals, which I used on a brown envelope, was rejected by those machine and returned. I guess it read the White part only and too low value, then no human rescue on it. Very sad.
http://www.collectgbstamps.co.uk/ex...?issue=23098