Question: What French empire was the  Imperial Bonapartist regime of  Charles-Louis Napoléon Bonaparte?
Sentence (from "Napoléon (coin)"): This article focuses on the 20 franc coins issued during the reign of Napoléon Bonaparte, which are 21 mm in diameter, weigh 6.45 grams (gross weight) and, at 90% pure, contain 0.1867 troy ounces or 5.805 grams of pure gold.
Relevant evidence: No