Ah, alright. eBay completed listings have a good range of prices on those, it looks like you'll do well.
I agree about vintage amps, I tend to put a 3-prong power cord and a fuse on any vintage gear that I plan to work on, but that isn't always agreeable to everybody.
At the local ham swap-meet this year, about an hour before the doors opened, a vendor decided to plug in a piece of untested equipment. I believe several capacitors blew out and the transformer smoked before he could get it unplugged. It wasn't so much that this was a fire hazard (oddly enough, the building next door caught on fire a few weeks later), but rather that the unpleasant smell of burning capacitors/transformers lingered for three to four hours.