Copper-alloy, 2.99 grams, 19.22 mm diameter. Circa 2nd century AD. The circular plate with inner and outer borders and with six raised pellets within the outer ring. The outer ring and centre is recessed and has traces of red enamel at the centre. Reference: Richard Hattatt Iron Age and Roman Brooches, number 521A. Without the pin but attractive. Provenance: found Hitchin, Hertfordshire, England.