Sold by Weber & Tschundi SA. I did a chamber cast since there are at least two different 450-400s. .450/400 2 3/8" caliber, 28" barrel, S/N 4659, Two leaf rear barrel sight front blade on a ramp. Blue barrel, blue Martini frame, double set triggers. Overall this is an excellent rifle retaining a lot of the original blue finish. The bore is bright and shiny. The stock and forearm shows some nicks and dings.