I myself collect Australian and German mainly, also have quite a comprehensive collection of Commemorative war related medallions from 1885 to 1945 Australia.
If I can help anyone with that information please ask.
Ok,
First coin 20mm and quite a heavy little coin that is 5mm thick. 13.46 grams


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Second Coin 23mm at the widest point I thought is Roman ?


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Third coin 16mm and 3mm thick and 3.35 grams


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Fourth coin 17mm very light weight
