Leica iii 1939. what exactly is this ?

Leica IIIs are worth nothing compared to the later Ms. Like $250 give or take.
You could also have bought a Soviet knockoff; if it has any waffenamts or swastikas, it's probably a Soviet knockoff and in that case is worth about $30.

They are very fun to shoot, I bought one to use while my M was in for a CLA and now shoot the III more than the M.

Like all leicas a few things will factor in on the price, over all condition, mechanical condition, black paint vs chrome, has it been upgraded (leica offered upgraids where you could turn a IIIa to a IIIf), pre war / wartime / post war, history (did someone special own it), and vulcanite texture, to name a few factors.

$250 plus or minus $100 is average for a IIIf, an old III is probably on the south side of $250 but without knowing more it is hard to say. some are worth a lot more and some a lot less.

>>3065805
I've had that serial number before, it's a fake. Pretty cool but not worth much at all. The gold fake ones covered in nazi insignia are fucking dope though.

>>3065805
antique.

>>3065805
Post a pic so we can tell if it's a Russian fake.
Even if fake it's still worth something, but I hope you didn't pay a lot for it though.

>>3065851
>You could also have bought a Soviet knockoff

Leica III is almost never faked since the Soviets only made Leica II copies (ie no front dial).