In middle school, Dan Scoglietti rode his bike through Chicago, picking up old beer cans with his twin brother, Ed. It was an odd hobby for a pre-teen in the 1970s that turned into a lifetime pursuit. "We'd go to junior high and trade beer cans," says Scoglietti, now 57. "Today, I do it all the time."

On Thursday, the twin brothers welcomed hundreds of other beer can collectors in Albuquerque to "CANvention," an annual gathering sponsored by the Fenton, Missouri-based Brewery Collectibles Club of America. For 49 years, the group, and its predecessor the Beer Can Collectors of America, have organized conventions celebrating vintage beer cans from brewers around the world. Collectors came to trade, buy and sell beer cans dating as far back as the post-Prohibition era. They examined special-edition cans dedicated to NFL teams selling for only USD 5 to those from the 1930s going for up to USD 3,000. Some collectors traded beer cans connected to the thousands of craft brewers who used complicated art to adorn their cans. Others featured Chicano images while some focused on the regional landscapes of their brewers.