Single horn in Eb an F
Melchior De Vries, Lier (Lierre), ca 1920

The rotary valve on the back of the instrument can add additional tubing to the F-horn, allowing to play the instrument in Eb. This was a practical feature in Belgian wind bands that often did not possess horn parts written in F. Commonly, valve horns with changing crooks (as the Van Cauwelaert Gantois or Mahillon 499) were used, so this model with a fixed leadpipe is quite rare. The instrument is very solidly built, but heavy.
This particular instrument belonged to a wind band in close to Genk in the Belgian province of Limburg.