A fully restored Mason and Hamlin grand piano in model BB is worth $40,000 to $55,000, as of 2014. The Mason and Hamlin BB is a 6-foot, 11-inch grand piano that is the equivalent of the Steinway model B.
The Mason and Hamlin model BB piano is a concert-sized grand piano that's best suited for concert halls, conservatories, professional studios and auditoriums. It has a rich, resonant bass register and is often a difficult instrument for piano technicians to voice properly. Even though on paper the Mason and Hamlin BB is comparable to the Steinway B, most professional pianists find them very different to play and have a definite preference for one or the other.