Matchbox has produced a lot of different Caterpillar models over the years, and much like the #18 Caterpillar Bulldozer (click here to see mine), there are a few different versions of the #8 Caterpillar Tractor. Here is a very brief comparison of the different models:
#8A Caterpillar Tractor | 1955-1957 | 1 1/2” | driver, no blade
#8B Caterpillar Tractor | 1958-1960 | 1 5/8” | driver, no blade
#8C Caterpillar Tractor | 1961-1963 | 1 7/8” | driver, no blade
#8D Caterpillar Tractor | 1964-1966 | 2” | no driver, no blade
This example of the #8D Matchbox Caterpillar Tractor is another of my Wichita eBay scores. The 1964-1966 #8D was only made in yellow paint with black wheels. Mine is unfortunately missing the rubber tracks.
Matchbox | 1964-1966 | #8 | Caterpillar Tractor | yellow with yellow metal base, missing tracks | England | black plastic rollers
The Race Case MBX 