Back in the Mid 1980s I had a client bring one of these"So Called Purdey Self Openers"into my W/Shop I pulled it down & Mystro McIntosh took a couple of "Rolls of 35mm roll-Film"The gun was built for Prime Minister Harold Wilson, and presented to him by The then Premier( I think Kosegin) Apologies for incorrect spelling of names).It was a "Splendid example of TULA GUNMAKING. I had it around for a couple of weeks, we shot a box or 2 of 1 1/4oz Pigeon Loads, it was too heavy for much recoil. The Single-Trigger was not working well. I have several photos of the complete inside workings, Locks,Trigger, Ejectors, & safety. I think Shooting Sportsman Mag' published several of my photos in our "Technicana Col. There is a "Time Served Gunmaker from Tula, living in Mass."Excellent workman"Sergay Lyenka"(My spelling) he is a wealth of INFO' on their guns. DT/CC.