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Isle of Man 2015 - 175th Anniversary of the Penny Black Stamp-Proof Fine 999.9 1/5oz Gold Crown.
The best gold restorations are a high-noble alloy, meaning that at least 60% of the crown is made up of gold and other precious metals like platinum, palladium, and silver that are noted for their low-reactivity with human tissue and resistance to corrosion and oxidation.