Great Britain 2001 cats and dogs booklet imperforate sheetlet of ten error, SG2187aa
A very fine unused (self adhesive) imperforate sheetlet of ten still within presentation folder. This ranks among the rarest of modern British errors and a real trophy piece. Pierron records only three examples. No longer priced in the SG catalogue following their change of policy to not list prices for the rarest errors, which are so infrequently traded on the open market. Prior to this change, it was listed at a value of £22,000.
