Item #G31579
Silver frame, with iron core, magnetic, vaulted, maker marked "K.M.ST." (Königliche Muenzamt Stuttgart, Stuttgart) and marked "D.R.G.M." (Deutsches Reichsgebrauchsmuster = patented) on the reverse, marked "800" (silver) on the pin, 43.8 mm, unusual sliding catch ("mousetrap") mechanism, extremely high quality, better than extremely fine.