Carta Blanca (Blank Check) was introduced byCuauht_moc Brewery in 1890 in Monterrey, Mexico. This beer was the original beer of the brewery, and was the flagship beer, until the 1980s, when the Dos Equis line began to overshadow it, after the merger with the Moctezuma company in 1985. At 4.5% alcohol, Carta Blanca is an easy-drinking, mass-produced lager, and is widely available, typically in 32 oz. bottle in six-packs of 12-oz. bottles in select locations. Cans are rare but are produced.