Because if you go to Tony Clayton's site, the first copper halfpenny illustrated with a right facing single bust is William III. There are three imaged, the first is in the author's collection and the second courtesy of Spink, but neither has any reference to rarity. The third is the DEI GRATIA, listed as three known and ipso facto is guaranteed to be more appealing to the money grabbing/rip-off merchant mindset. It has us talking about it for a start. I contacted the seller. The description has been changed. £2.99 opening price? Very optimistic!