11/20/17 - This is an original WW2 era production gravity knife. These knives were used by Luftwaffe pilots and can open if the latch is opened and the knife is turned upside down. This allows for opening with one hand. This gravity knife is in minty condition with a beautiful, unsharpened blade and excellent wood handle. The maker stamp is on one side of the blade and crisp. There is also a drop-down "pick" piece that comes down the base end of the knife. Guaranteed original and authentic.