Brass knuckle duster, with the words "PATENT" on one side and "BOXER" on the reverse. This used to be displayed in the headquarters of the Central Scotland Police.
knuckleduster Imperial War Museums
knuckle-duster British Museum
knuckleduster Imperial War Museums
File:Jur Knuckle Duster.jpg - Wikimedia Commons
Any Knuckle Duster Experts? - FIELD & PERSONAL GEAR SECTION - U.S. Militaria Forum
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Search results - Falkirk Council
Folding Knuckle Duster – Brassknuckle
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Eagle King Knuckle Duster Four-finger Safety Defense Boxing Broken Win – KNUCKLEDUSTER