Thanks for all your help!
I have PMed you in the past and thanks. As far as the outlet in the back, I haven't looked to deep into this but the rear flue and everything back there is riveted so changing doesn't look easy. However there is a slide lever on the bottom rear that closes off the lower vent. Old technology alludes me. I need more research. What I don't know is what the small door above the shaker grate is for. Maybe to help shake the ashes down with a poker? From grate to top of fire brick is 13" and diameter is 9". I will send a pic of doors with the shaker handle and slide lever (loop ring) I am talking about.
This stove literally has the surface rust in the last 8 months out of it's 120 years of life. My fault for not seeing it's significance. It was in a 3rd floor quarters for its entire life. I plan on cleaning it up and using it in the family room of my house just for conversation as well as heat.
Was the stove you were looking at an antique? From what I heard, These stoves were up to 80% efficient! Thats amazing for that age. As far as work, hell yeah. They only needed attending every 12 hours. I feel like scrooge with my lumps of coal
. My wife would still rather have a wood fire when we are downstairs that I have to feed every 20 minutes during a movie
. Thats why I want to put this unit upstairs and flue it into the downstairs flue. We use that flue about 6 times a year. Movie night of course