Thank you all.

My great-grandfather's fiddle is labelled Stradivarius 1721 and my late grandmother claimed to believe that it was authentic. I commented that I had read somewhere there there were only about half a dozen Stradivari unaccounted for and she said exactly, there are some unaccounted for and this could be one. But she ignored all suggestions of getting it appraised, so I think deep down she knew...

Marion