I believe Dirt Guy is correct...it is the Brinkman...I have the exact same rig, although I have made several mods to mine. I can tell you that I would not sell mine for $100!
check it out good; the bottom of the fire box is where you will find rust and rot if it hasn't been cared for properly - look for rust and/or heavy pitting (inside and out)...If its not rusted out, I would offer $75 and see what happens..
On your way home pick up 3 cans of high temp paint and a wire brush, stop by the local car wash and blast it clean inside and out, then when you get home wire brush everything and give it a good paint job (especially the outside bottom around the fire box).
Good mods for the Brinkman:
Tuning; tuning means adding steel plates inside the cooking chamber to route the heat and smoke so that, when "tuned" you have even heat distribution. Without tuning, the fire box end will be as much as 30 or even 40 degrees hotter than the other end.
Chimney; The brinkman chimney from the factory comes out the top of the cooking chamber just behind the door, taking the smoke with it. by lowering point where the smoke enters the chimney by either extending the chimney from the inside almost to the cooking grate, the smoke will spend more quality time with your meat! I took it a step further on mine and welded a 5" chrome stack coming out of the end at the bottom
Thermal Stabalizer; How about that for a high tech sounding term??!! I put bricks in the bottom of my cooking chamber...the theory is that the bricks will get hot and retain heat, so if by chance I do need to open the door for some reason, once closed, the temp will return quicker.
firebox grate; The stock grate will not last! ( you can see in the pic on the bottom shelf the remnants of the wire rack that was the original!) IF it has one, plan on replacing it... expanded metal works great!
Cooking racks; I had to replace the little sheetmetal tabs at the from edge of the firebox and cooking chamber that holds the cooking racks; a piece of 3/4 angle worked great...
Thermometer; Replace it or ignore it! get a good thermometer... find a good digital dual probe... one probe in the meat, one in the cooking chamber - 'nough said!
Future mods;
ball valve drain
new work table
bigger tires (for moving around the yard as I see fit!)
Buy it! its a great little cooker!