Toccata and Canzon by Bernardo Storace.
This example from Storace's sole manuscript dated 1664 contains many cases where it is not clear whether to play e-flat or e-natural.
GIF files for on-screen viewing
Page 1, Page 2, Page 3, Page 4.
PDF file for download and printing. (If you should get a blank page, try clicking "back" then "forward")
Link to page on Storace's Passacaglias
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