Prototype Japan Folding Knife 4" Locking Blade Vtg Pistol Grip Handle Black!Prototype Japan Folding Knife 4" Locking Blade Vtg Pistol Grip Handle Black! customer told me his dad was a salesman for guns & knives, said this is a prototype, couldnt find same knife anywhere. have another proto knife were going to list! selling off a few knife collections! check out our other auctions! if you know more about this let us know! (not an expert) selling as pictured. more than welcome to pick up at shop in butler pa & save shipping.