Mitten gauntlets
Some medieval mitten gauntlets had a built-in knuckle duster. When the hand was bunched into a fist the backhand protection becomes pronounced from the fist just above the knuckles, this allowed the user to utilize the gauntlet as a melee weapon while still protecting the hand from damage when punching.
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Mitten gauntlets
However, against an armed combatant the use of this feature would have been risky so it was very unlikely that a gauntlet would have been used in this way when a more suitable weapon was within reach.