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The coins were originally minted in two denominations, 20 and 40 francs for Napoléon Bonaparte. The 40-franc gold piece did not become popular. [8] 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 20 franc coins are 21 mm in diameter (about the size of a U.S. five cent piece), 1.25 mm in thickness, weigh 6.45 grams (gross weight) and; at 90% pure, contain .1866 troy ounces or 5.805 grams of pure gold. The 10 franc coin weighs 3.23 grams and at 90% purity contains 2.9 grams (0.093 troy ounces) of pure gold.
The LMU adopted the specifications of the French gold franc, which had been introduced by Napoleon I in 1803 and was struck in denominations of 5, 10, 20, 40, 50 and 100 francs, with the 20 franc coin (6.45161 grams or 99.5636 grains of .900 fine gold struck on a 21-millimetre or 0.83-inch planchet) being the most common.
The 1262 monetary reform established the livre tournois as 20 sous tournois, or 80.88 grams of fine silver. The franc à cheval was a gold coin of one livre tournois minted in large numbers from 1360. In 1549, the livre tournois was decreed a unit of account, and in 1667 it officially replaced the livre parisis. [3]
Gold coins in denominations of 10, 20, and 100 francs, known as Vreneli, circulated until 1936. [58] Both world wars only had a small effect on the Swiss coinage, with brass and zinc coins temporarily being issued. In 1931, the mass of the 5 franc coin was reduced from 25 grams to 15, with the silver content reduced to .835 fineness.
In 1925, 5,000 pieces of a 100 francs version were minted. The first series of banknotes, issued 1907, included no 10 or 20 francs denomination. The gold coins existed in circulation alongside the corresponding banknotes during 1911–1936. With the devaluation of 1936, the gold value of the 20 franc coin rose to 28 francs.
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For example, knowing that standard 18-karat yellow gold consists of 75% gold, 12.5% silver and the remaining 12.5% of copper (all by mass), the volume of pure gold in this alloy will be 60% since gold is much denser than the other metals used: 19.32 g/cm 3 for gold, 10.49 g/cm 3 for silver and 8.96 g/cm 3 for copper.