Looks more like it might have been a grader part pattern. To some people even a backhoe is a "Dozer".
Actually, like Norm said it's a pattern, not a mold. I would guess a drop box for a grader or maybe a loader...whatever, it's cool, & a work of art...patternmaking is an art all to itself.
I'm not a "Grader" expert but judging by the size compared to the couch.
It would have to be a BIG Grader!
Other than that I have NO Idea!
It is cool though!
You have a wonderful day. Best wishes. Deas Plant.