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Congrats with yet another splendid find at Black Burn, George!
It is quite a puzzling design; the cup to small to make contact with the groove which makes it a keyhole-type of motif and the number of (partial) rings is hard to tell. Four or five?
The other 21(!) panels are on BRAC:
rockartuk.fotopic.net/c681264.html
Cheers,
Jan