Battersea Spiral Penannular Plaid BroochA fixed pin penannular style plaid brooch. The design of this brooch is inspired by the Battersea Shield, considered to be one of the finest pieces of Celtic Art to have survived from the Iron Age. Dredged from the Thames in 1857, it is assumed to date from sometime between 350 and 50BC before the Romans first came to Britain. Brooches with large movable central pins were near universal as garment fasteners in the Iron Age, although the design was