Martini-Henry M1854 bayonet
Manufactured somewhere in England, or at least the United Kingdom. Actually there’s a possibility it was done in Germany.. Anyway. – serial number 221.
Of course this model of bayonet predate the Martini Henry itself, which was developed in 1870, but during a short period of time the British army was equipped with breech-loading rifles with socket bayonets, pretty neat.