Colin Barton asked for a valuation on the copper coin featured here. It’s a Charles II farthing, which is dated 1673 beneath the seated figure of Britannia on the reverse.
We’ve featured a few other copper coins found by Colin, all of which have been in well above average condition for detecting finds. He seems to have discovered a site, in which base metal coins turn up in the same condition as when they were lost two or three hundred years since. The site must have some kind of preservative element in the soil, which stops copper coins being eaten away by corrosion.
Colin’s farthing would grade good Fine so it shouldn’t be worth any less than £60 to a collector, provided that the surfaces are as good as they look to be in the phonographs.