I notice in your text you state that the above stone was "not shown in this position on OS 25" 1898 it has presumably been moved here from NM 8154 6136 but there is no local knowledge of the circumstances."
I have seen a copy of the OS Map 1st edition 1872 from the National Library of Scotland (http://maps.nls.uk/view/74427310) which clearly shows the stone in its current location.
Hope this helps!
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