Chassepot Bayonet.........

[Walkwolf]

'Manufacture d'Armes de Chatellerault' - made
mid 1873 onward.........

http://worldbayonets.com/Misc__Pages...t_markings.pdf

[skypilot]

I have a couple of these myself that I recently acquired. In fact, they are looking for a good home, preferably one that has spare British/Commonwealth bayonets to swap with!