1809

Dieudonné & Schiedmayer

1845

Schiedmayer & Söhne
Neckarstrasse 14-16

1853

Schiedmayer Pianofortefabrik
vormals J. & P. Schiedmayer
Urbanstrasse 27
Neckarstrasse 12

Stuttgart

The heraldry above explained:

Left: Royal Court of Württemberg "Furchtlos und Treu" > "Faithfull and no fear"
Middle: Royal Court of Berlin (German Empire and Prussia - Kaiser Wilhelm)
Right: Royal Court at London

Heraldry in stationary used in 1897:

Top: Hause of Sachsen-Coburg und Gotha
2nd row: Left: Londen; Middle: Berlin; Right: Stuttgart (Württemberg)
3rd row: both to be investigated

Royal Court of Württemberg (Stuttgart)