Your bayonet is a British Pattern 1907 for the .303 caliber Lee-Enfield No. I Mk. III rifle. This example was made in February 1944 at the Orange Arsenal in Australia. The scabbard was made by a private contractor in Australia, Mangrovite Belting Pty. Ltd. The X is the bend test mark, indicating that the blade steel met specs. for tempering. The crosspiece is bent, but can probably be straightened with care. Otherwise it looks to be in great shape. Australian P1907 bayonets are worth about twice what a British one brings, so congrats on a nice P1907 bayonet.
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The bayonet cannot be abolished for the reason, if for no other, that it is the sole and exclusive embodiment of that willpower which, alone, both in war and everyday life, attains its object.—General M. I. Dragomirov