This is a 1/25 scale models published by Orel in A3 size. It is the first in a current series of 2 earthmoving models published.
History on the prototype can be found here:
https://trucksplanet.com/catalog/model.php?id=2208
Part 1 and 2 are the tractor frame rails. The two side of part 1 nest together nicely.
Greg