It wouldn't, and you are correct that the Bb tuba is a contrabass.dgpretzel wrote:Why would a BBb tuba be called a baritone tuba? (I thought a BBb tuba was referred to as a contrabass tuba)
The eBay listing you linked doesn't call the horn for sale a "baritone tuba." The category it's listed in is merely "Baritones and Tubas" which is shortened in the Product Type as "Baritone, Tuba."