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Isle of Man 2015 - 175th Anniversary of the Penny Black Stamp-Proof Fine 999.9 1/5oz Gold Crown.
1 Gold alloys â This crown is a mix of gold, copper and other metals. In addition to providing a strong bond to the tooth, it doesn't fracture, nor does it wear away the tooth itself.  Base metal alloys â This crown is made up of non-noble metals that are highly resistant to corrosion, and make for a very strong crown.