It is one of only 700 known extant Stradivari instruments .
The Viotti ; ex-Bruce Stradivarius of 1709 is an antique violin constructed by luthier Antonio Stradivari of Cremona ( 1644 - 1737 ) .
It is one of only 700 known extant luthier instruments .
The Viotti ; ex-Bruce Stradivarius of 1709 is an antique violin constructed by luthier Antonio Stradivari of Cremona ( 1644 - 1737 ) .