of that century; the moniker "Dos Equis" (Double X) was originally just a nickname, but it became widely known by said nickname, as a result the "Siglo XX" name was dropped in favor of "Dos Equis" The original version is the Dos Equis Ambar, a Vienna-style dark beer. This was Cervecería Moctezuma's best selling beer in the 1940s and 1950s. Demand for the beer has resurged, especially in the United States, where it is now the best-selling imported dark beer. The clear version of this brand is a lager derived from the Ambar. Sol was introduced in the 1890s as El Sol. The name (Spanish for The Sun or Sun) came from a ray of sunshine that fell on a pot while preparing the mash. After being off the market for many years, this brand was reintroduced in 1993, and is now exported to many countries in Latin America, Europe, Asia and Australia. It is a very light-coloured beer with little hops flavour, and considered to be a beer for the young people and the working class. Sol is known for its sexy advertising. Sol comes in a number of varieties. Sol 2 is a stronger flavored beer, Sol limón and sal have lime and salt flavors already added, and there is a Sol Cero, a nonalcoholic beer in regular and lime and salt versions. Tecate was originally brewed by Cervecería Tecate, and is named after the city of Tecate, Baja California. The local brewery there was bought by Cuauhtémoc-Moctezuma in 1955. It was the first beer to be canned for retail sales in Mexico, with Tecate Light launched in Mexico in 1992. Tecate is one of the best-known brands in Mexico due to its patronage and sponsorship of Mexican sports teams and sporting events. Noche Buena (literally Good Night, referring to Christmas Eve as the good night) is generally only available around Christmas. Many people wait for this beer's availability each year between the months of October and December. Noche Buena is a strong-flavored, dark beer named after the poinsettia plant or noche buena in Spanish, which decorates the beer's bottles and cartons. Carta Blanca was Cervecería Cuauhtémoc's first premium beer, first marketed in 1890, and is technically a pilsner. The name means "white card" in Spanish, which at the time was given to people as a sign of respect. Carta Blanca was successful when it debuted at Chicago's