CELTIC PENANNULAR BROOCH
A Celtic brooch, called also penannular brooch, made with a scrap piece of thick copper wire.
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(from wikipedia) Penannular: ("Annular" means formed as a ring and "penannular" formed as an incomplete ring) brooches feature a long pin attached by its head to a ring; the pin can move freely around the ring as far as the terminals. There is a gap between the terminals wide enough for the pin to pass through. Beginning as utilitarian fasteners in the Iron Age and Roman period, and in Ireland and Scotland from about 700 to 900, which are popularly known as Celtic brooches or similar terms. The brooches were worn by both men and women, usually singly at the shoulder by men and on the breast by women.