Thirty or more years ago I imported one of these, cased, with express sights, a rib on the barrel jacket, engraved and stocked by one of the famous English makers. It was set up for a flashlight which plugged into a battery in the forend. My recollection today is that both special flashlight and special battery were missing and there was no way to duplicate them save at prodigious expense. I sold it to the gent who wrote the little book on 8s and 81s, he in turn resold it, I ran into him at the last Vegas show a month or so ago and he had lost track of the buyer.
