What is "vreneli"

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 (legal tender ceased September 29, 1936.