The answer: nothing.
This Pasquale Vinaccia & Sons bowl back mandolin is for sale on eBay with $1,735 BIN price (accepting offers too).
https://www.ebay.com/itm/Mandolino-P...8AAOSw2bRd7qJa
The Italian seller says the mandolin was "restored by a skilled luthier". You may wish to take a look at the mandolin pictures and decide for yourself what the real "skill" of that luthier might have been.
To my eyes, the most striking restoration perversity is the use of Phillips screws to secure the tuning machines onto the headstock. Then, there are some excessively thick modern frets which do not belong on an old Neapolitan mandolin. They also seem to have used a poorly fitting guitar string pin for the makeshift headstock finial, as the original and proper bone (ivory) finial probably got lost or broken. Then, there are some very crudely executed crack repairs that can be seen on the pictures, and so on.
I'd say this is a fairly typical example of a sad situation in general: many a fine vintage bowl back mandolin got ruined not only by reckless owners/players, but also by dilettante "restorers".
(Alas, as a side note, causes of a loss of well preserved antique mandolins go beyond careless use and repair. There are also mandolin damages inflicted by savage handling by various carriers. Then there are modern day rapacious seizures of antique instruments by overzealous United States Fish and Wildlife Service, under CITES etc. regulations. )
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