The T-34 indeed had a Christie derived suspension…
The hull has little however to do with the suspension system…
I believe it is a Christie design… a T-4E2 medium “Combat car”. I found another web page with the same picture which identified it as such, and it was described as follows:
The last tank to be built using Christie’s convertible track design was the T4. Sixteen of the T4s were built during 1935-1936. These tanks were armed with a .30 caliber bow machine gun, and two machine guns in the turret, a .50 caliber mg and a .30 caliber mg. The T4 and T4E1 were both determined to be under-powered during testing. Both tanks were declined for standardization because of the lack of offensive firepower and high cost. The T4 was twice the cost of the M2 light tank and had less firepower than the M2. Tanks could only be owned by the Infantry, Cavalry had to hide tracked vehicles from Congress by calling them “Combat Cars”. Tanks were usually - though not always - fitted with a cannon plus machine guns. The covertable Christie suspension allowed tanks to run on either track or wheel and were true engineering marvels for their time.
You can see “T-4” painted on the side of the tank.
Excellent photos…especially love the control tower photo. Thanks for sharing your story…and photos!