Okay, a club member found a couple of photos of a 1930's era tank that I have dubbed the "nipple tank", because the turret(s) have a rounded protrusion on them/it that looks like a nipple.
This tank has 5 road (fairly large) road wheels, is rear sprocket drive, and the sprocket looks very similiar to the Czech LT vz. 35 tanks. The track is very fine in pitch, like some of the late 20's/early 30's French AMR tanks. There is no sponson, like a Char or Churchill, although the tracks do run up and over, no fenders.
The reason I say "turret(s)" is there is a 37mm gun in the top turret. Below that is possible a second turret, with water cooled MG's port and starboard, and what looks to be a fairly long barrel 75mm gun.
So, we have some classic Soviet design clues, (wide track, plenty of MG's), some French design clues (fine pitch track, possible hull mounted cannon) and a Czech drive sprocket. What the hell is this thing?
Bruce