This boxwood alto recorder is a copy of one of the instruments by J.H. Rottenburgh (1672 - 1765) in the Musical Instrument Museum in Brussels.
The first of the instruments below is tuned to the original pitch (410 Hz) with single holes and the original Hotteterre fingerings.
This version is tuned to 415 Hz with normal baroque (English) fingerings and double holes.
You can listen to this instrument here:
Michel Blavet : L'Insinuante (1732)
Robert Carr : An Italian Ground
(The Delightful Companion, 1686)