Bulgari Magsonic Sonnerie Tourbillon watch – £464,000
When Bulgari purchased Swiss watch brand Gerald Genta, the most relevant result was this model: the Magsonic Sonnerie Tourbillon. Magsonic is made in titanium, though it is also made in 18k rose gold. The titanium (versus gold case) is probably a better idea if you are interested in the main feature set of this timepiece because gold will absorb more sound.
It also has a tourbillon and a power reserve indicators.