These are the 237 Mercedes Benz Racers. There are three varieties I know of, the red cast hubs, red plastic hubs, and the spun hubs. The front one has the cast hubs. I got it in a collection from a friend of mine. It is all original including the tires. I will not do anything to it. 

The middle one has the red plastic hubs I got in a collection from a friend in Edmonton. It needed a driver, a repaint, and a decal kit. Below is what it looked like when I got it.

The rear one has the spun hubs. It had been over-painted and needed a driver and steering wheel, A few hours with some acetone, a rag, and a dental pick and I got it down to the original paint. I doubt I will repaint it. Here is what it looked like when I got it.