I tracked it down. It is a variant of the Austro-Hungarian M1888/16 bayonet, converted for use on M95M rifles, with the barrel ring removed some time later.
So, it was, indeed, converted into a knife.
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I'm no expert, but it certainly wouldn't be uniform since the handguard lacks that hook for ensaring the opponent's bayonet
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Leading up to WWI, and nearly universally afterward, hooked quillons were done away with (thanks to snagging on barbed wire and hooking other soldiers in trenches). Those that did retain a hooked quillon were almost exclusively long bayonets.
A shorty like this one would be exceptionally odd to have a hooked quillon.