NSN. Made circa 1750 – 1800. 30 caliber with a 29” barrel. This is a Bellow System Operated Air ? Spring gun. One used the spanner wrench to open the springs and let air into the bellows. When the trigger was pulled, the springs released compressing the bellows and expelling the air. These guns fired darts at about 300 feet per second! This gun is in very good condition the barrel is nice and sharp with an even brown patina. Wood is very good. The stock has a Swiss profile.