I definitely would not know, but it may be worth the effort to see if the barrel has a Purdey serial number on it somewhere. The metal work appears expeditiously prepped, and I'd suspect that someone recut the engraving on the receiver. It has the feel of a parts gun that got a take off barrel that was sitting around for just the right project.
I don't think original Purdey work would have such a finish mismatch between the barrel and the receiver. The auction is long over, but I'd hope there were multiple many times more usable pictures, or the buyer had a chance to look it over in person. In just a little bit there should be a new book out about Alex Henry, I wonder if that ser. number will have an entry and a bit of info.
