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Isle of Man 2015 - 175th Anniversary of the Penny Black Stamp-Proof Fine 999.9 1/5oz Gold Crown.
And even with a porcelain covered metal crown, the alloy under the porcelain is a quality metal -- Platinum/Palladium/Gold. There are machine-made crowns, which are cheaper in price, but again, I'm not really a fan of them. They look fake, but the biggest problem is they don't fit very well.