I don't see any mystery. It is just a standard '07 bayonet made at Lithgow (MA) in 1941 and shortened into a knife by some rough bastard! Common practice in the '50's and '60's when they were available in standard issue condition (no scabbards) in most NZ sports shops for 2/6d (25 cents) each. I bought several of them as a kid in the late '50's from Turner & Le Brun in Ch-Ch.
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