As foretold the Christmas Robin Faststamps were available from Post and Go machines last week. Their first appearance was at the British Postal Museum and Archive in Phoenix Place, London WC1, and the first day of issue of the plain version with no further inscription was at the Stafford Stamp Show on Friday 8th, Saturday 9th November.
Discussion on their appearance at Post Offices - click here.
This doesn't really qualify as a variety but was a natural product of the machine with a little foreign matter trapped in the roll. As you can see from the numbers it did not affect a continuous run, with strips starting with number 19 and number 25 unmarked. (There's nothing on the back of any of the strips.)
It could be stray ink, but could be something else!
I'll be contacting regular customers about these as soon as possible, but if you want to write please do.
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