As discussed on TMP, I saw this beast on a very poor documentary concerning "Nazi Cows" or some such nonsence. The clip is very short, perhaps 2 seconds long, however the vehicle (Sd.kfz 10?) can be seen and the armament is not a German PaK36, 38 or 40. The shield suggests that it is Soviet as does the lack of muzzle break - the cannon barrel is just visible in the last half second.
I am sure it is another of the numerous "field conversions" seen so often but if anyone has more details I would be very interested.
