The piano is one of the three which it is certain that Beethoven owned.
It is made by Conrad Graf, who probably gave it to Beethoven on 26th January
1826 (his Broadwood, a gift from the latter, was in very bad repair).
The piano is varnished mahogany and is 4,43 meters long. The keys are
of ivory and ebony. Its range is from C 0 to F 6. The Graf is the last
of Beethoven's pianos.
Source:
Beethoven-Haus Bonn - Cd "Beethovens Klavier"
The two other pianos, the Erard piano (of 1809, without doubt) is on
display in a museum in Linz, and the Broadwood, received in 1813, is to
be found in a museum in Budapest.
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