Double Horn 103 Alexander Model: 103GL pitch F /Bb, Gold Brass & Lacquer

TRIPLE HORN Alexander Model: 301 pitch F/Bb/High F,  Bell 31cm

Full Double Horn in F/Bb E.schmitd Trifenried/France

Triple Horn in F/Bb/High-F E.schmitd Trifenried/France

Double Horn in F/Bb C.F.Schmidt 1934 Berlin or Weimer / Germany 3 rotary, 1 Périnet piston

Compensating double horn in F/Bb August Knopf Markneukirchen/German 5 rotary (E/A key)

Double Horn -V1 ? Mark Veneklasen 1960s Fort Collins / Colorado / U.S.A ? Illustration is not completely accurate because  information not enough

Double Horn -V2 ? Mark Veneklasen 1960s Fort Collins / Colorado / U.S.A ? Illustration is not completely accurate because  information not enough The Czech company "M.Jiracek a Synove" manufactures a similar double horn in F and B♭ (Model Nr.101 "Supin") with four rotary valves arranged in a square. “This unique design allows airflow to pass through the valve in one direction, greatly reducing acoustic resistance.”