This bayonet has a typical Collins style long hilt.  The smooth ribbed brass hilt is 125 mm long and has 14 ribs.  The muzzle ring is flush to the hilt flat and the inside diameter is 22.9 mm.  There is a forward swept round finial on the bottom of the guard and no finial on top of the muzzle ring.  The press stud and spring are typical Collins construction. The center of the cross guard does not have a steel rivet through the blade.   

Shawn Gibson Collection

The lug slot is chamfered around the top edge and there is a 10.5 mm guide slot.  

Shawn Gibson Collection

The only example recorded has been flattened on the right side of the muzzle ring were is is stamp with what appears to be a rifle mating code. 

Shawn Gibson Collection

This bayonet's guide slot is very similar to the Model 1862 Remington Zouave bayonet or maybe more so, Reference #231.  The difference is the location of the press stud or the lock-to-muzzle length.  Without measurements, it can clearly be seen that the lug slot and press stud is much deeper into the hilt of this bayonet.