The Marx factory was in the same industrial estate as the Corgi Toys factory. In 1948, the Hudson Motor Car Company made a detailed in-house promotional model of its "step down" 4-door Commodore for exclusive use by their dealers. The model was exceptionally well done, and came in four authentic two-tone color combos, but sadly, was never available on the retail market. Some sources erroneously insist this model was made by Marx ("Automotive News" 1948), but in fact, it was Hudson's own production effort, manufactured, produced and assembled in Hudson's main factory. Soon after, Marx fabricated an injection mold of Hudson's more precise model and marketed this simplified version as a more inexpensive mechanized toy. It was available as a police car in grass green or a fire chief car in bright red. The clear windows of the original were replaced with a single, stamped metal piece with lithographed images of cartoonish policemen or firemen. The police version even had a shotgun protruding through the windshield. With batteries an oversize roof light lit up and the gun made a corny rat-a-tat sound. Not one of Marx's more successful toys, their Hudson was large and unwieldy, being aimed at pre-teens. After newer, more modern American cars appeared, the Marx Hudson quickly became obsolete, resulting in an oversupply on retail toy shelves. By the mid-1960s they were still easy to find across America and one could usually be bought for about a dollar – a nice discount from the original $4.95 list price. A well-preserved Marx police or fire chief Hudson with original box will still bring from $50 to $100 in today's market, depending on condition. An authentic Hudson promotional still brings around $2,000. Over the years, professional Hudson experts have upgraded Marx versions to look somewhat like the original promotional – these usually bring from $600 to $800. Marx also made Studebaker and Packard vehicles especially through the 1930s and 1940s. They often appeared with the Studebaker badge logo in a very promotional way, though evidence of Marx as a promotional provider is uncertain. One of Marx's later Studebakers was an Avanti with a dented fender that could be replaced with a 'repaired' one, which was odd, as the real Avanti had a fiberglass body – and would not dent. A 1948 Packard Fire Chief's car was one that looked, in theme, much like the step-down Hudson.