My main machine is a 33 year old Viking 990. I'd be heartbroken if it stopped working, so I've been watching on eBay to get a spare.
This one came up a while back, and I saw it and meant to ask DH, but forgot. It was on a Buy-it-now and still there when I left work, but Sold by the time I got home. Oh well, can't when them all.
The next day it showed back up with an even lower Buy-it-now price, and I jumped on it!
The listing said "very nice condition, no control, sold for parts/repair".
This machine looks unused. The attachments and bobbins are still with the original plastic bags, and the machine had the blue plastic around the edges of the arm to protect from scuffing. There is not a mark of use on it.
I plugged it in, it powers up and runs, but I didn't do anything else until DH has a chanse to give it a once over. It's likely this machine has not seen much running time in 30 years, so a good going over will make sure nothing is sticking from lack of use.