Microbrew - beer brewed in a small commercial brewery. In the U.S., a microbrew is a beer produced at a microbrewery that brews no more than 15,000 barrels of beer per year. Brewed and distributed on a regional basis, some microbrews are also known as craft beers.
Mint - A can in perfect condition.
NABA - National Association Breweriana Advertising. Another of the breweriana collector's groups, the NABA concentrates on items other than cans. Founded in 1971. They publish a magazine six times a year and hold their annual meeting in the summer.
Never filled - A can that never held beer which is missing its top or bottom lid. The status of the lid is what makes them different from "air-filled" cans. The lid must never have been attached to the can, cutting the top or bottom lid off with a can opener does not count. Often the lip of the can is unrolled, making it unusable as a drinking mug.