Redleg is incorrect on two counts. The kit was never a Renwal kit that was passed to Revell. That's not even the original 1/40 scale Revell kit that came with the Long Tom in that box. The one in the box pictured above in his post is the Nitto kit in 1/35 scale. I am looking at mine right now. It was designed to be motorized with the logo NITTO imprinted in the batter compartment on the underside of the hull. The tracks are a black rubber continuous loop (rubber band). Besides, Renwal issued military kits in 1/32 scale and not 1/40 scale.
Steve Adams designed a line of military kits for Revell in 1/40 scale. When Revell decided not to produce any more military vehicle kits, Adams took the 5 molds he made and started his own company Adams Action Models (later Snap Adams). He took the High Speed Tractor, 155mm Long Tom, M20 Armored Car, Jeep & trailer and the GI battle figure set.
The actual Revell High Speed Tractor designed by Adams included stiff, silver vinyl tracks that had to be connected at the ends. Revell issued it alone and with the Long Tom. I have it in the "Life-Like" boxing.
I'm actually working on the original Revell M4 Sherman tank right now. I had an ancient kit that was missing some bits & pieces. I was lucky enough to see a bagged lot of spare parts for sale on eBay for $5. In the photo I could see the Sherman suspension pieces I was missing. It was quite the find for me.
In this shot, you can see the silver vinyl tracks. This is the boxing with the Long Tom.
This is the kit you want to find if you want the original Revell 1/40 scale Adams designed kit. I have one in this boxing:
Bottom line, I have both of the high speed tractor kits, the one Redleg says is the Renwal kit (but is Nitto), and the Revell/Adams kit in the Life-Like box. They are not the same kit and not the same scale.