clearly this stove has been restored (look at those cement seams, hex nuts, etc.), Someone added gasketing to the doors and top already (I'm not thinking that's original, do you get any pressure on those gaskets when the doors are closed?)
I don't know wtf that vent is above the flu outlet
(old timers manual Baro damper I guess?
or adding air above fire for Bit?)
I don't see how hot gases can go down around firepot to get back up out flu and I don't see any redirect air channels or levers to allow hot gasses to recirculate through the base (so it not a baseburner).
That rear fresh air intake over the rear flu has me baffled... no pun intended