Circular Trumpet, French

Al's Mellophone Page - The Circular Alto Horn

It doesn't seem to make any noise, but would be for decoration only.

Antique Brass Circular Trumpet Horn for Decorative Use Only

Jimmy Page Looks Back At 50 Years Of Led Zeppelin Billboard

Handbell Workshop Basic Cleaning And Polishing Tips

Cows' Horns, Digeridoos, etc. [Natural Trumpets] 33: Circu…

Pocket Cornets and Trumpets — Robb Stewart Brass Instruments

Circular Signal Bugle – Duke University Musical Instrument Collections

French horn - Wikiversity

Circular Signal Bugle – Duke University Musical Instrument Collections

Handbell Workshop Basic Cleaning And Polishing Tips

Endangered Instrument: French Horn - Sound Scotland

Jimmy Page Looks Back At 50 Years Of Led Zeppelin Billboard

VTG Mid Century Brass Decorative Round Christmas French Horn

Cornet: 'Circular' - A. Sprinz - Hartenberger World Musical

French Horn for Beginners Brass Gold Lacquer Body Cupronickel