Knife bayonet for the 7.62 mm. NATO caliber Senapan Panjang 1 (Long Rifle 1), a variant of the BM59 selective-fire rifle. The Senapan Panjang 1 was manufactured at the Bandung Weapons Factory, in West Java, under license from Beretta.

The trademark on the ricasso is the Rutherford Model (Atom Symbol) inside a gear. Collectors refer to this trademark as the "atomic meatball."