This looks like a fantastic example from above.
Archives
Ger Tor End of Stone Wall
Hamlyn Newtake
H Hamlyn Boundstone, Willsworthy Brook Reservoir
Reference: The NGR and details for this boundstone were kindly supplied by Steve Grigg on his Dartmoor Explorations website. Steve credits Maureen and Robin Vane in Dartmoor Magazine #123, page 77. It is also mentioned by Dave Brewer in his Dartmoor Boundary Stones Book.
Willsworthy Brook Stone Shelter
Purpose currently unknown. Related to the reservoir or a tinners’ hut?
Reference: The NGR and details for this stone shelter were kindly supplied by Steve Grigg on his Dartmoor Explorations website.