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Conn 1910's Helleberg Tuba Mouthpiece | V & E Simonetti Historic Tuba Collection
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Old CG Conn Elkhart Eb, anyone know the shank measurements I need a mouthpiece for it. : r/Tuba
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C.G. Conn Helleberg Series Tuba Mouthpiece - 120, Gold-plated | Sweetwater
Conn Model 7B Helleberg Tuba Mouthpiece Silver - SSE Music
