Nice find! It's listed in the handbook as 'Spanner, No 523' and detailed as for spring compressor. Yours is obviously Australian but is the same tool. No picture in the book though so nice to see one.
It's listed amongst the contents of the stores box, which I do have so will need to look for one myself! When I restored my gun, I just used an adjustable hook spanner.
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Adrian Barrell
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