How many Stradivarius violins are unaccounted for?

Related questions

1. Who has a Stradivarius violin?
2. Do violins sound better as they age?
3. Is The Red Violin a true story?
4. Is it a real Stradivarius violin?
5. How many Stradivarius violins are left in the world?
6. Are all the Stradivarius violins accounted for?
7. Why are Stradivarius so expensive?
8. Can you teach yourself violin?
9. Is violin harder than piano?
10. Is it hard to learn violin?

Tags

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15. #harps
16. #thousands
17. #estimate
18. #bearing
19. #copying
20. #labels
21. #model