Page 2 of Italian bayonets...
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Italian m91 bayonets...from the right...later leather scabbarded m91 with steel blackened reinforcement.  Second from right is a leather scabbard with brass reinforcement.  Third from the right is the less seen "fluted scabbard".  It is also a TS bayonet that side mounts onto TS carbines that have the bayonet lug to accept these variations.  Notice the release botton at the end of the pommel.  There is a smooth steel scabbard which is very rare.  It was reportedly made only in the late 20's.
Two TS bayonets side by side..  Notice the left hand bayonet has a pin through the pommel.  Reinforcement of some sort?  These TS bayonets were supposedly made side mounted to preclude their being yanked off a rifle during bayonet combat.