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  2. Napoléon (coin) - Wikipedia

    en.wikipedia.org/wiki/Napoléon_(coin)

    The 20 franc coins are 21 mm in diameter (about the size of a U.S. five-cent piece or a Swiss 20 Rappen coin), weigh 6.45 grams (gross weight) and; at 90% pure, contain 0.1867 troy ounces (5.807 g) of pure gold. The 40 franc coins are 26 mm in diameter, weigh 12.90 grams (gross weight) and; are 90% pure gold.

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