Early viennese signed Michael Weis, in Prag 577 St.

Measure (mm)
— lengh 2185, width 1030, hight 805
Case — cherry
Compass — FF-a”’
Dating — ca 1800-1805
Bichord to g#’, three chord to a”’. Single bridge on the soundboard, divided nut FF to F
3 kneelevers: bassoon, dampers, moderator
The instrument is not restored
Bibliography
M. N. Clinkscale, Makers of the piano 1700-1820 - Oxford University Press, 1993 - pag. 320