Well, there's a funny thing! I spotted this on eBay today.
According to the seller these unprinted 2nd class stamps came in a pack from Royal Mail's Tallents House Bureau. The pack is listed now with a 9 February end date.
If you have such a plentiful supply of blank 2nd-class, I'll have a strip of both please.
Just sold for over £77.00, unbelievable. I wonder how long it will take for the Farm Animals or the Union Flag to appear?
Well if people are going to be this gullible I can see a nice little cottage industry developing. Whilst this item is probably genuine it's going to be very easy to fake.
What with unscrupulous individuals pulling strips from machines to create artificial "errors", and others selling dubiously obtained blank strips, post and go are a ready source of several little cons. Caveat Emptor.
This reminds me of the 2004 Classic Locomotives Mini Sheet Presentation Pack which was easily and regularly faked and sold as such in significant numbers at inflated prices.
The 2nd class is the one item which has not been widely available. Many of the other blanks which are on the market have been found in PO waste bins from roll ends or obtained by favour when a jammed PO machine is being sorted out.
This hasn't happened with the 2nd class, which have only been available in a controlled environment (Stamp Fairs or Pop-Up Shop) when somebody has been in constant attendance.
But yes, we might expect someone to 'create' some from blanks or other issues, as was done with the Locos MS, and indeed the locomotives short pane ex PSB.
£77! Is that the tippy tappy noise of numerous new eBay listings being created I can hear? And all featuring blank Post & Go stamps in packs "as sold by Royal Mail"? This hobby amazes me sometimes. About a year ago I turned away an offer of Union Flag blanks in packs at a little over twice face. They were said to have been sold by a philatelic counter.