4 weapons match your filters.
Brass Knuckles
Brass knuckles are Syndicate's brawling weapon, a metal grip over the fist that turns every punch into a heavy blow. Jacob starts the game wearing a pair, and they suit his straight-at-them fighting style, though Evie can equip them too.
Cane-Sword
The cane-sword is a walking stick with a concealed blade, and in Syndicate it is the melee weapon to pick when you want to stun and control a fight rather than end it fast. Evie starts the game with one, and the twins' version hides a second, scythe-like blade in the sheath.
Kara
Karas are steel or iron bracelets that Evie wears as her main close-combat weapon in the Jack the Ripper expansion. The Indian Brotherhood used them as arm guards and as knuckle-dusters, so they hit much like brass knuckles.
Kukri
The kukri is the deadliest of Syndicate's three melee weapon types, a curved Nepalese chopping blade that Jacob and Evie can both equip. Pick it when you want enemies to die quickly; it trades away some of the stunning power a cane-sword gives you.