I think that might have been a Marcos. One of my favorite Corgi models when I was a kid was (and still is) a Mini Marcos. The model has built-in jack stands with removable wheels and tires and is very nicely detailed. Sadly, I lost one of the wheels a few weeks after I got it, so didn't really ever play with it. Hence, after many years, the model is in very nice condition, and now has some aftermarket wheels and tires on it!