I have a J P Sauer & Son / VL&D NY Knock About made about 1900. This is a heavier gun @ about 7½" with 30" Krupp bbls. It has 2 3/4" chambers & is marked "70" on the extractor face. Due to German proof laws very few guns built prior to 1912 received the "Optional" Nitro Proof. As I recall the mode of testing was made more realistic with the 1912 law & Nitro Proof became mandatory on guns other than muzzle-loaders etc. I purchased this gun at a rather low price as the complete forend was missing. So far haven't gotten a round tuit so haven't shot it yet. I very highly suspect this gun would quite readily handle the regular 1912 vintage, 2 3/4" Nitro Proof, but of course was not so proofed.
