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Lovely motif. How many times did I drive along the Butterstone Road from Dunkeld to Blairgowrie over the years? I should have stopped and gone for a walk!
The centre "boss" looks like it has a little stalk sprouting (top left) out of it in the photo. Does it emerge on the other side of the ring at the top left? This particular motif reminds me of some of the Stronach Wood RA near Brodick.