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Flandria
You can see similar round markings on mine but maybe not as pronounced. I bought this cassette second hand as shown so no idea if the previous owner had his RD adjusted properly or not.
I compared mine to an image of a new set of 17-19-21 from an onine store. The teeth do look to be narrrowed down on both forward and backward facing edges but I don't see any sign of the hook or shark tooth shape you see in worn cassettes. I'd estimate the width of the teeth are reduced by about 30-40%.
Replacement cogs cost nearly the same as a full Miche cassette so I've got a Miche on order.