I have seen many nice ones sell in France for around 2,000Euros or less, but retail from a dealer could be 3,000 to 3,500. The trend seems to be a little higher further away from France though.
Three Hundred Euros (estimate), if you can get to Vichy in south-central France, early in April .... (or learn French, bid online, get a hard case, get a courier, get insurance, take your chances...)
Don't know how "decent" it is, the back is partially unglued, the binding is partly missing, theres a crack in one side, and the frets/board has had work done. Lot 36: http://www.interencheres.com/en/Furniture-and-art/instruments-a-vent-et-cordes-pincees-ie_v111293.html
That looks like the real thing alright. Auction companies have to be careful in their descriptions and attributions, so if it is not signed they may be wary of stating that it is a Di Mauro. Certainly there were many not signed, whether that was just an oversight or whether it is because they were supplied to retailers who sold them under their own brand, but it is a fact of life that people like to spend money on a name or label and without it, this one will probably go cheap.
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Don't know how "decent" it is, the back is partially unglued, the binding is partly missing, theres a crack in one side, and the frets/board has had work done. Lot 36:
http://www.interencheres.com/en/Furniture-and-art/instruments-a-vent-et-cordes-pincees-ie_v111293.html