Playing with Google's reverse image search found this.
Asking price was 9 grand http://www.desertclassics.com/Sold6/cad61white.html
This very scarce 1922 Fordson crawler tractor with White heavy duty 2 speed power take-off PTO SN 2658 with winch and boom came from Butte Montana. It was used by Montana Power Company to lay gas line. Everything is stuck and it needs to be restored. If you want an early Fordson that no one else has, you need this rare crawler tractor."
____________________ See y'all later, Forrest. Screw the rivets, I'm building for atmosphere
It's not as hard as you think I would show you the jig but the photo I have is much to large but here is a small photo that shows the original rubber tracks and the styrene tracks for comparison.
I think mine look better! Grin.
The styrene that holds the tracks together must be really thin and by the way they don't move it's just a static model.
I built the crane with a new cab and tracks as it was to modern for me