As the promos themselves became more popular, the models were used to convert window shoppers into buyers. For example, in the 1950s, AMT made plastic dealer promos of the Ford Edsel that were given to precocious children after their parents had taken a test drive. Companies such as Johan (also spelled Jo-Han) made friction-drive promo cars that kids could race around a showroom floor while the adults haggled and bargained.

In the late ’50s and early ’60s, Johan also made a promo with a torsion chassis for Chrysler, to coincide with the Torsion-Aire Ride suspensions being marketed by the automaker. In the 1960s, at the height of the transistor radio craze, Ford and other companies built AM radios into their promos—naturally Ford’s featured Philco radios, which was a division of the auto giant at the time.

By the 1960s and ’70s, as the differences between promos and toys began to blur, muscle cars became the most desirable dealer promos to collect. The Ford Mustang was an obvious favorite, but Thunderbirds and Galaxies were also in demand. Chevrolet had offered promos of its Bel Air in the 1950s, but that was also the decade for the first Corvette, which along with the Impala and Camaro was, and is, a widely collected car.

The condition of a dealer promo is important, so new collectors should look for a number of traits before purchasing. First, check for signs of damage caused by the tools that were used to assemble the car. If a hot tool touched a part of the car it was not supposed to, it will leave an ugly melt spot. Second, look for tire tracks on the roof or hood—when cars are stacked on top of each other for prolonged periods of time, the tires will often leave a black mark.

Finally, sometimes the plastic body of a car will warp but other parts will not. For example, Johan bodies tend to warp upward on the sides but the grills, which are made of a different material, do not, which gives the front end of the car the appearance of a smile. This problem is so common it is known among collectors as a "Johan smile."

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