Rempstone Stone Circle forum 5 room
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I think it's pretty much established that they are OS marks, and nothing all that exceptional.

Here's a thread about 'em from way back:

http://www.themodernantiquarian.com/forum.php?thread=6820

K x

It is an OS mark. There's one on the old railway bridge next to my Mum's house. They are weird looking things. There's also a little carving of a sailing ship in full rigging - testament to the sae faring heritage of the Dolgellau region.