The Ganassi recorder does not have double holes and the fingerings differ from the English fingering. The instruments are mostly build in 415 Hz.
The Ganassi recorder is modeled after a recorder described by Ganassi in his book about recorder playing. Pictures from the book and other surviving renaissance recorders were used to build today's Ganassi. It is believed that Ganassi never build a recorder himself. Sylvestro Ganassi dal Fontego was born in Venice (Italy) in 1492. In 1535 he published a tutorial about recorder playing. It was the first tutorial for this instrument. Its title was "Opera intitulata Fontegara". The picture above shows the title page.