I'd have said you should be able to get a couple of hundred quid each for the Hohners, maybe more for the Barcarole.

But it entirely depends on whether they're full size (120 bass) or less (80 bass, 48 bass, 24 bass etc).

The Hobgoblin website is also quite good for explaining the differences between types of accordion. I think they have an "Instrument FAQs) on their home