This is one of the the Madeln helms. It should date from about the same time as the Dargen helm (ca The shape is similar, but the ocular design is quite different. No added ocular here. Now in Schweizerisches Landesmuseum, Zürich.
The Battersea Shield was found in the area around Chelsea Bridge, London. Dated to 350 BC, the Battersea shield is from the La Tene era which is characterised by the spirals, circles, interwoven knots and lattices that remain in modern Celtic art.