Caterpillar Sixty:

This is a custom wooden model of a
Caterpillar Sixty. This is a famous bulldozer
made by the Caterpillar Manufacturing Facility
from the 1930's until the 1950's.
Original Caterpillar
Sixty:

In case you are not familiar with classic
tractors, I have taken the liberty of posting a
picture of a working Cat 60 so that you could
see just how truly accurate this model really is.
Caterpillar Sixty