Miniature terret ring. A very fine example of a late Iron age miniature lipped terret. The ring is of circular cross-section with six pairs of projecting lips around the hoop and a narrowed strap bar. Circa 100 BC - 50 AD. 26mm x 20mm, 9.9g. Similar terret rings were recovered from Hod Hill and are now in the British Museum. https://www.britishmuseum.org/collection/object/H_1892-0901-488
Cf. Jope, EM. Early Celtic Art in the British Isles, plates 288 - 289.