Like anything, it's only worth what someone is prepared to pay. I'm not familiar with those machines, but for something that old it seems like a lot to me. If you particularly want it, then buy it, me, I wouldn't. I once came across a similar harness machine (Adler, I think?) head only and the guy wanted about $700. It was old, knocked about and needed a bit of work, which I pointed out. He wouldn't budge on price so I walked, I suspect he still has it.