This bayonet has a typical Collins style long hilt.  The smooth ribbed brass hilt is 123 mm long and has 14 ribs.  The muzzle ring is flush to the hilt flat and the inside diameter is 22.9 mm.  The only example recorded has a 1 mm two digit number stamped vertically on the hilt flat between the muzzle ring and lug slot. There is a forward swept round finial on the bottom of the guard and no finial on top of the muzzle ring.  The center of the cross guard has a steel rivet through the blade.  The press stud and 51 mm long spring are typical Collins construction.  

The lug slot is chamfered around the top edge and there is no guide slot.  

The yataghan blade is 505 mm long, 27.4 mm wide, 7.4 mm thick and has unstopped fullers.  The only example recorded is marked COLLINS & CO / HARTFORD / CONN in three straight lines on the left ricasso .  The right ricasso is dated 1861.