These tractors were built from 1934 through 1952. There were 18 different designs over those years. The B model was extremely successful with over 300,000 sold. The model is by Ertl, and is quite crude, but it is a good stand-in, especially away from the front of the layout. According to farmmodeldatabase.com, this model was introduced by Ertl in 2002 and continues to be produced, usually as part of a farm set.