Hello Michael,
That is a "Leslie" speaker. I have to service the one at my church.
The bearings are shot.
If you get stuck or need a rare part talk to Bob:
http://www.tonewheel.com/services.htm
That's where I got my Hammond oil. Very friendly and helpful. His dog
was very friendly as well, he greeted me first.
Regards, Joerg
http://www.analogconsultants.com