Vreneli is the informal name for a range of legal tender gold coins produced in Switzerland. The formal name is: Tête d'Helvetia (French), Helvetiakopf (German) or Helvetia Head (English). The coins were issued between 1897 and 1936, in 1947 and in 1949. All coins issued after 1936 are restrikes. These coins had face values of 10, 20 and 100 Swiss francs and were minted in a millesimal fineness of 900. The coins are sometimes colloquially called, “Swiss Miss,” from the obvious obverse motif. The 20 franc coin’s reverse shows the Swiss shield, featuring the Swiss Cross, and a wreath of oak along with the denomination. The coins were minted at the Swiss Mint at Bern (although the die engraving was done at the Paris mint) and the coins are mint marked with a “B” (without a period). 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 ounces or 5.805 grams of pure gold. The 10 franc coin weighs 3,23g and at 90% purity contains 2.9 grams of pure gold. The 100 franc denomination was only struck in 1925 with a very limited mintage of 5,000.