Hi Bill I cant tell you much about this particular model, partly because she doesn't say what model it is. Have you asked what the emblem says below the bellows? Castelfidardo?
Clearly its a 3 voice, looks from the (poor) pics to be in pretty good condition which in my mind casts doubt about some of the story about it's travels abroad- plus the case also looks in good nick.
Then the other thing that doesn't make much sense to me is it says 'found' in the title, then something about it being given to her sister, then something found under a load of sheet music under the mother's piano?
I dont know why people need to include such BS - other than 'I dont know much' - means 'If this turns out 'duff' dont blame me'
But I would say that Jonellis are quite popular when they appear on ebay, so I'm guessing they are reasonably well sought after. It's Italian, light enough, and a pretty popular make - but...
I've bought loads of accordions from distance, but this is the kind of write up that I 'pass' on - unless I could go and touch it, smell it, play it. Or if it's very cheap. It isn't going to be the latter even if the bids stop now, so are you close enough to go?