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Hi. The green swirl looks like it might have an IoW mark on the base (a stylised flame). If you Google 'IoW impressed flame mark' you should be able to locate examples. Without a mark, these swirl weights are hard to attribute, because so many small studios have churned them out, as well as better known ones. But I don't think that being able to attribute any of them to IoW necessarily makes them more valuable - they are indeed car boot material IMHO!
Alan