Unlike some coins originally touted as having >5 examples, this coin never seems to have become any more common, by fresh specimens being discovered. In the October 1984 Freeman auction booklet, the Freeman 19, which was in a lot (No 14), with an F18 and an F20, incredibly, remained unsold at the auction. Although perhaps not incredible at that time.
Any rate, the one on offer on that occasion was described as "very worn but design discernible, one of two known specimens". Richard has a photo of one on his rarest pennies website, described as "held in a private collection (thought to be unique)" - although if the Freeman catalogue is to be believed, there is at least one more somewhere.
Or has anybody come across others? Just curious as to why no further specimens of an F19 have ever come to light in all these years.