Interesting mark near base, on Southern face of the stone.
Image credit: Nicki MacRae
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Sorry S but that looks natural .
Ahh my mistake then. I had it in the back of my mind looking at it today, that the Highland Archaeological Database has is down as 'Cup Marked Stone?' and so was rather presuming that was what they were referring to (I've not visited it in a couple of years and couldn't recall what I had noticed before)... but maybe the other possible mark I posted up is? Who knows! :-)
I think you have the right marking but as they say in the report they are not evident in the pics they saw , your pic is quite clear and it still doesn't look man made .
Really interesting, thanks tiompan!