can you punch with a knuckle knife the same way you are supposed to punch with brass knuckles, how did the boys use these in the trenches? : r/martialarts
Black Knuckle Knife - Folding Knuckle Duster Knives - Black Brass Knuckle Knife | KOMBATIV
Knuckle Knives
Brass Knuckle Dagger, US 1918 - Metal sheath (15 cm) - DragonSports.eu