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Isle of Man 2015 - 175th Anniversary of the Penny Black Stamp-Proof Fine 999.9 1/5oz Gold Crown.
In theory, real gold will show indents from your teeth; deeper markings indicate purer gold. This is actually not a recommended test, as you can damage your teeth. Not to mention that lead is even softer than gold and gold-plated lead will appear to be gold when you bite it.