Thank you, Pipeliner. Gun is mine, a 12 gauge Avant Tout Cosmos. Bought at auction in the UK, the gun was reproofed at 850 bar in London in 2002 after a dent was raised and the chambers opened to 70mm. The gun is cased with Cogswell & Harrison marked oil bottle, chamber brush and snap caps. Also has rod and jag and brush and swab. Two maker's labels, one paper and one leatherette to glue in the case are included.
Ken Owen has regulated the gun with his .735 Fosbery projectiles. He also fixed a worn sear and recrowned the barrels .50 rounds of his ammo is included along with 25 extra projectiles and mould, tongs, and roll crimper for making more.
Price is $5200. $$ for Dave if it sells, of course.
Regards, Tim
Here are pix: