De Prins, BB flat tuba, 3 piston, ca.1930 Tag #: 200710 Serial #: 20837 Bell Diameter Bore Size Height 16 7/8″ .661″ 37.0″ Comments: “L’UNION FAIT LA FORCE” on seal with coat of arms on bell. “Solist / * / De Prins Gebr / GEBREVETEERD / ANTWERVEN / BELGIE 20837” on second valve. Share this:TwitterFacebookLike Loading...