The eBay Calace I'm seeing, closest to the one we're discussing, is this one at 1600 Euros. I notice that's the middle of the range, which varies roughly from 20% to 200% of that price. That's a huge price range!
There are a handful of top luthiers in Italy who restore these, and sell in the range similar to new Calace concert instruments (~3000 Euro range). But caveat emptor, because there are also restoration "experts" (in Italy and elsewhere) who do poor work, and sell at prices not too far below. Here in the US, you see unrestored Calace instruments in various levels of playability. I got one around $300 once. But I also paid around $3k in Italy for a properly-restored Calace, from a reputable luthier -- and it was worth every cent.
Unfortunately there was a huge range of quality in the instruments to begin with, so it's hard to know what you're getting, unless there's a chance to line up several and compare. So how to tell the value of any one Calace instrument? who knows? Things are worth what people are willing to pay for them, and people can be unpredictable.
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