Counter Insurgency Support Office (CISO) manufactured prototype bolo. The piece measures 15 inches overall with a 10 inch steel blade, wooden handles, nicked rivets and a leather wrist strap. The handles are ink marked #4 on one side and YOGI on the reverse. This is one of two prototypes I purchased from the designer Conrad Ben Baker who also designed the infamous SOG knife.
The piece also comes with a tag that translates to:No. 4 canvas fabric use sample, metal reinforcement plate is #28, GI Sheet.