Copper-alloy, 13.61 grams, 42.03 mm. 4th-5th century AD. A good example of a late Roman supporting arm bow brooch comprising a transverse bar with pierced lugs for the attachment of the spring pin developing into a narrow bow and expanding trapezoidal footplate. The outer face is decorated with groups of transverse ridges with facetted panels between. The sturdy catchplate is in place on the reverse. Supporting arm brooches were adopted by Germanic troops in the 4th century AD especially where they were in contact with the Roman army as auxiliary troops; they are most common in northern Germany and the Rhine delta but are also found in the Thames Valley and Essex. Reference: Hattatt, R. A Visual Catalogue of Richard Hattatt's Ancient Brooches, Oxford, 2000 item 1731. Very fine condition. Provenance: from an old English collection.