Well....it appears my reasoning was bad
For all I know, it's either an E or an H, which are like the only models actually used (the B is totally different lol). I know it's early production though because of the cupola and the wheels. I don't know if there's a way to tell the difference between E and H from the outside though, it might've just been a change in the transmission.
Yes I like tanks, I have several books on them and I used to study them a decent amount XD
I haven't for the past several years, so I'm sorta rusty, which is ok, because it's useless knowledge lol