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@hippy
That looks like one of the older style screw-on clsuters. They are different to the newer 8-9-10spd cassettes - the small cog holds them together, not a lockring.
To take yours apart you need two chain-whips, one to hold the main sprockets and one to undo the smallest sprocket (which holds the others on).
Although, looking at it again it seems to have spines.. I can't remember if my old 6spd had splines in the middle or not? Hmm..