Double horn. Nominal pitch: (F+B♭) and (F+A).
- Place of production:Mainz/Rhineland/Germany
- Date of production:First half of 20th century
- Collection:University of Edinburgh
Double horn. Nominal pitch: F+B♭.
- Place of production:Brno/Czech Republic
- Date of production:probably 1960 - 1980
- Collection:University of Edinburgh
French Horn. Compensating double. Nominal pitch: F + B♭.
- Place of production:Erfurt/Germany
- Date of production:1906-1919
- Collection:University of Edinburgh
Double horn. Nominal pitch: F+B♭.
- Place of production:Paris/France
- Date of production:Circa 1914
- Collection:University of Edinburgh
Double horn. Nominal pitch: F+B♭.
- Place of production:Italy
- Date of production:Circa 1950
- Collection:University of Edinburgh
Double horn
- Place of production:Germany
- Date of production:1950–89
- Collection:National Museum of the Royal Navy