1800 tequilas are made by Casa Cuervo from 100% blue agave. The name comes from the "historic event" of aging tequila in oak for the very first time. The line was first launched in 1975 as a premium sipping tequila. 1800 Reserva Reposado tequila is the first of the sipping tequilas launched by Cuervo and called the "original premium tequila." The tequila is aged for at least 6 months in French oak.