Im sure you have seen some of the info on this larger size pot belly posted here already Dexter #5 coal stove
The value is totally dependent on condition... I will say that people are getting very smart about old coal stoves (mostly in part because of this forum)... The value of most pot belly's is not so much in their function (because their is far superior in terms of antique parlor stoves, base burners & such) but more in their aesthetics, This pot belly does not have great aesthetics to those looking for a garden ornament or nice lil' corner plant stand in the living room. It's size is also a problem and its function is very questionable (even if it was in MINT BRAND NEW condition!)... therfor... My opinion is this...
If its in mint, usable condition and all parts are their and someone has refurbished it by taking it apart and re cementing/bolting, etc... it could be worth a few hundred (but i doubt its in that kind of condition)... if you posted pictures of the insides, outsides, grate, firepot, flu, etc. i would tell how it looks.
If it has not been rebuilt but merely spray painted and vacuumed It might be worth $100 to someone wanting it as a Chimnia out on their patio.
I wish i had better news for you... but thats about what your looking at, it has neither form or function (on its best day) and because of that the value of this stove is not much.
As some examples a form of pot belly that has function would be a "station heater", a form of pot belly that has esthetics would be a Variety or small pot belly with more intricate casting work, shapely womans body and filagree.