Christopher Ganer square pianoforte in a mahogany case circa 1775.
Having two hand stops, forte/celeste. 5Octaves compass from F to F.
Christopher Ganer was born in 1750 in Leipzig and died in London in 1811. In 1774 his workshop was at 48 Broad Street, London but by 1807 he was listed at 47-48 Broad Street.
Christoher Ganer and George Garka were both members of the legendary group known as the "Twelve Apostles", piano makers, many were German born and some were Dutch. They were said to have fled to England during the seven year was. They established successful
The Twelve Apostles:

1. Americus Bakers
2. Frederick Beck
3. Adam Beyer
4. Gabriel Buntebart
5. Christopher Ganer
6. George Garcka
7. John Geib
8. Meincke Meyer (Partner of Zumpe)
9. Johannes Pohlmann
10.George D Schoene (Successor of Johannes Zumpe)
11. Sievers (partner of Buntebart)
12. Johannes Zumpe