While reviewing ebay actitity i noticed a load of listings from the same seller having almost identical date stamps, apart from this the cancel just looks wrong - general impression too clean, the ink looks weak and of a blue-black apperance (would expect solid black), the stamps themselves look very clean almost of mint appearence and where they are on piece the paper looks too clean. Most appear with a DEC 21 date stamp.

I believe all of below are forgeries :

  this one appears to have a date of 1868 ?.. well before stamp issue date, sold £1.20

  sold £56    sold £37    sold £32

  sold £23  sold £28  sold £19  sold £8    sold £16

  sold £16  sold £23     sold £16  sold £16 

 sold £3  sold £16  sold £16  sold £43  sold £16  sold £16

 sold £1  sold £1