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A crown cap -- the kind with fluted edge which are pressed onto a glass beverage bottle -- is made from tinplate steel. The seal inside was originally a slice or cork, later a composite of cork granules bound together, and currently is a PVC liner. Those interested in crown caps as a collectible should visit www.bottlecapclub.org Most metal screw caps for glass beverage bottles are aluminum with a PVC liner.

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17y ago

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