I started to build a record of rare/scarce penny sales around 2000 and although I no longer record low grade F14's, I've just checked and I have logged 23 examples since then, only 2 of which were below Fine, and 1 NVF. I wonder whether the new bronze coinage was still enough of a novelty for the newspapers of the time to mention the signature under the foot ? As Jerry says, rather like the Kew gardens 50p.