I have an interest in British higher grade singles and own a few. They are rare as hen's teeth in the states with seemingly not much interest in them. The last Holt's auction seemed to be flush with them, with a lot not making reserve and languishing in the "get rid of 'em" followup auctions. I couldn't bid on them because the estimated import costs in total were generally higher than the value of some of the guns. They are ofen antiques in the US but not obsolete to the British, which causes a problem. It seems a whole class of interesting guns are being relegated to the junk heap over rules.
