I have a Oliver Powerflex 500 amp that has the head that comes out of the unit with a sewing machine type motor in perfect condition
Cool units. I met Jess Oliver a few years ago at a gathering of amp builders. He was close to 90 and sharp as a 20 year old. He brought with him one of these amps and I got to play through it a bit but with a bunch of 100 watt guitar amps around I didn't get to actually hear it much. I think you have to be a member for a week before you can post pics, I'm looking forward to seeing them.