Manufacturing date unknown, sometime between 1981-89. When we bought it in 2010, the original owner told us this:

1.) Added manometer after gas valve for precise flame adjustment.

2.) Sealed agitator gear box with silicone to keep out chaff

3.) Changed rear sprockets to bring drum speed up to 44 from 26

4.) New analog thermometer in faceplate (still have original gauge)

5.) Added TC bean probe below trier (type K, 1/8")

6.) Added TC environment probe above and to the right of faceplate gauge (type K, 1/8")

7.) Added TC ambient probe in hopper (type K, 1/8")

All bearings have been regularly greased, the exhaust blower motor oiled, chaff collection area cleaned out every roasting session, and the exhaust venting regularly cleaned out. There have been occasional minor problems, all of which have been dealt with immediately. These include:

1.) The miter gears in the agitator gear box have a tendency to work loose, requiring a retightening of their set screws. This is why I sealed the box (thinking chaff might have something to do with it).

2.) On one occasion, one of the leads to the pilot ignitor came loose, preventing the pilot from lighting and thus the burner as well. I refastened it in its place.

3.) On a few occasions the set screw on the drum sprocket has worked loose, requiring to be retightened.

4.) One of the TC hookups on the NI 9211 does not work, thus it only supports datalogging for three probes instead of 4.

All in all, we have had remarkably little trouble with machine. It is fully operational (has to be, as it's our current production roaster!). A new NI9211 unit (with chassis) costs around $700. We are asking $14,000, not including any shipping fees. Let me know if you are still interested, or would like any more specific photos. We still have the original crate.