OK, out of my comfort zone, but found this whilst browsing for C1 copper farthings on eBay http://www.ebay.co.uk/itm/PROOF-IN-MINT-CONDITION1665-SILVER-PATTERN-FARTHING-CHARLES-II-/181588290800?pt=UK_Coins_USA_RL&hash=item2a47816cf0 Relative to the price of the top-end copper C2 farthings, this doesn't seem off the planet. Period? Real? What? anyone for a really quick potted history on this? A beautiful looking thing, I have to say!