Musician David Aaron Carpenter playing the Stradivarius viola
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Stradivarius viola may fetch $45m at auction

28 March 2014 Last updated at 09:58 GMT

One of only 10 Stradivarius violas believed to have survived, the Macdonald Stradivarius, will be sold at auction in June, it has been announced.

The viola, one of just two made by Antonio Stradivari still in private ownership, is expected to fetch at least $45m in the sealed bid auction.

Mark Eames reports.