Possibly the ONLY known example of a soprano Eb Helicon made by C.G. Conn Company ever!! - YouTube
Grade 2 Tenor Horn, Soprano Cornet, and Tuba Scales in Eb (treble clef). ABRSM. New from 2023 - YouTube
Soprano helicon - Wikipedia
Tuba Diversity
Wright Eb Soprano Saxhorn — Robb Stewart Brass Instruments
Mind-blowing' tuba player holds a five-minute note using circular breathing - Classic FM
Boston Circular Eb Soprano — Robb Stewart Brass Instruments
Rotary 6-valve F Tuba 'Linz' - TF436P – Wessex Tubas
Amazon.com: Soprano Sax Music Box Rotating Tuba Musical Box Retro Golden Instrument Model Tabletop Decoration Box Classical Music Box Gift for Girls Boys Birthday Holiday Mini Saxophone : לבית ולמטבח