I don't think gold and early proof sets really count for many collectors - they're now mainly collected by investors from what I can see. Which of us is going to fork out the best part of 100k (or the best part of half a million upwards for a good 1839!) for one of the old proof sets? Especially as you could pick up a nice one for 10-25K 20 years ago.
Anyone seen the Philip Richardson mainly Soho collection now listed on DNW? There's 200 lots on there. Some nice coins....
I notice one anomaly, to do with the gilt 1797 inscribed edge KP5 penny. DNW refer to the coin as a one off, and the inscription was referred to in Peck as a later adulteration in a footnote. Now, whether it is or not I don't know, but In Baldwins 47 (Gregory II) one of these was the front cover coin, in beautiful and brilliant mint state no less. A stunner. However, a more ropey one turned up in their auction a few years later, scratched and edge knocked, but it was given exactly the same provenance as their supposedly unique earlier mint state one. This is the one in DNW.
So either someone bought it in Baldwins 47 (£2,800 hammer), kept it in their pocket for several years, then resold it (£460 hammer!), or more likely there are at least two of these coins in existence, both identically and incusely inscribed. In which case it is more likely that the edge is a contemporary and official addition.