Brass Knuckle Knives: How Are They Made?

Tacticlol Knives II: The Return of Ridiculous, Page 58

Brass Knuckle Spring Assisted Folding Pocket Knife

TOMAHAWK BRAND® US 1918 Trench Brass Knuckle Folding Knife

Why are brass knuckles made from brass? - Quora

The Incredible Brass Knuckle Knife And Its History

Cold Steel': American Trench Knives of WWI

Brass Knuckle Knife: Why Do People Use It for Self-Defense?, by Ashlybrine

This illegal switchblade was a 'bestseller' on .ca until it was reported to the company

Combat Cleaver Trench Knife and Sheath – Fire Kissed 1095 Carbon Steel Blade, Brass Knuckle Guard Handle, Distressed Finish – Length 15”