In 1987, Mad magazine produced a set of pins as a special premium for magazine subscribers. Each of the set's 24 pins featured a classic Mad cover from the past. Given that just three pins could be obtained at a time, and only as a premium for ordering a three-year subscription, complete sets were extremely difficult to obtain. After the promotion concluded, some of the remaining inventory of pins were made available for sale in packages of two. The company that manufactured these pins, Bi-Rite Enterprises of Chicago, eventually went out of business, leaving 350 complete sets among the company's liquidated assets. Without that find, it is unlikely that any complete sets would exist today. One of the remnants of that find, a complete set of 24 pins in Near Mint condition, one of just a few hundred complete sets known to exist.