Compare the animal/interlace of the strap-end with those of the cross shaft fragment of St Oswald's Priory, Gloucester (shape of the eye, shape of the thorax, "wild" interlace,..)
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picture of the cross shaft ftagment from:
"The Making of England  -  Anglo-Saxon Art and Culture  AD 600-900"
edited by Leslie Webster and Janet Backhouse
1991  The Trustees of the British Museum and the British Library Board by British Museum Press