Difficult to tell if the markings are modern or date back to the circle
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Looks like someone earmarked it for splitting.
Mentioned in 'Standing with Stones'
Couple of old threads
headheritage.co.uk/headtohead/tma/topic/53184/threaded/662688
headheritage.co.uk/headtohead/tma/topic/61839/threaded/785681
Similar to Clune Hill up here
themodernantiquarian.com/post/94541/clune_hill.html