A WW1 Rare American Trench Knife Knuckle Duster - Sally Antiques
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Brass Knuckle Dagger, US 1918 - Metal sheath (15 cm) - DragonSports.eu
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1918 Trench Knuckle D/A OTF Auto Black Handle D/E Two-Tone Blade
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