I believe there are four or five at this museum.
Boston, Museum of Fine Arts
Said to be dated 1701.
London, Horniman Museum
I believe the Horniman has one.
London, Royal College of Music
Paris, Musee de la musique
St Andrews, Museum of the University of St Andrews
description on Culturegrid
Sverresborg, Trøndelag Folkmuseum
Vermillion, National Music Museum
6177 by Johan Karp, Copenhagen, Denmark, 1709
Simon Chadwick, St Andrews, Scotland.
June 2013, last updated May 2015