This is a WW1 s98/05 bayonet that has been shortened. Presumably the hooked quillon has also been removed. It is highly likely this is a Turkish conversion of the 1920's, who commonly shortened WW1 german bayonets, but I could not be certain that it was not done by a German soldier during WW1.
There would originally have been a date mark on the back edge of the blade, near the hilt, so you should be able to see exactly how old it is. Here is one of mine dated 1916.
Edit, I notice that as well as no quillon it also has a muzzle ring, which has been added, so I'm very confident this is Turkish conversion but I will be interested to hear other opinions.