MA - Mangrovite Arsenal but apparently they just made the 1907 full length bayonet. Could have been shortened any time, or it could be for the Owen.
From: https://collegehillarsenal.com/austr...ne-gun-bayonet
"In August of 1944 the new Owen Mk 1 bayonet was adopted and the pattern was sealed. It retained the same hilt and grip pattern of the P-1907, but utilized a 10” blade instead of the 17” blade of the P-1907 bayonet. The World War II era bayonets were produced at the Orange Arsenal in Australia, and are marked “OA”, while the post-World War II version manufactured in 1953 was produced at Lithgow and is marked “MA”. Another World War II variant of the Owen bayonet was the Mk 1 /1, which was made by cutting down existing P-1907 (No 1) bayonets. On these Owen bayonets the 17” No 1 blade was cut down to 8”. "
This bayonet's blade measures exactly 7.5" so that is not clearly likely.
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