Vintage Detail
Boosey & Hawkes Kosi-Kup Euphonium No. 3
Core Specs
Archive Context
Archive Notes
Kosi-Kup was a major Boosey & Hawkes/Hawkes-era brass band mouthpiece family. The euphonium No. 3 profile is documented around a narrow 25.0 mm cup diameter, 6.70 mm throat, medium to medium-deep cup concept, and the British medium shank used on Imperial-era low brass. It represents the lighter, focused mid-century British brass band sound before the Sovereign/Denis Wick large-shank transition. Use these measurements as a comparison starting point: fit and response still depend on the player, dental structure, instrument receiver, and each manufacturer's measuring method.
Known Variants
Community Verification
If you have played, measured, or documented this model, confirm the archive entry to strengthen its reliability.
0 confirmations
Confirm only if you have owned, measured, or documented this model.
Forum Sources
Player Reviews
Played this piece? Add a quick player rating. Start with three feel taps; context and notes are optional after that. Anonymous by default, no login required.
Add Quick Rating →No Player Ratings Yet
Help start the reference for this mouthpiece. One quick player rating gives the next player a better starting point than specs alone.
Player Notes0 reviews
No player notes yet
Help start the reference for this mouthpiece. A short setup note or one quick rating is enough for the next player.