You need a copy of Peck. Appendix 9 p.608-12 refers. There was rumoured to be only three in existence in Feb. 1802. Then only 2. They changed hands for £400 and up. One sold for 750 guineas at auction. Finally, in April it was noted there were 11 already advertised for sale at between £100 and £400 each. Someone offered a gilt one for £500. Someone even offered to pay off the national debt in exchange for a patent to make Queen Anne farthings. Mr Average UK was, is, and always will be gullible, ever anxious to chase after that elusive pot of gold without question.