The cello is described as dating from 1630. The exact dates of Antonio Amati (son of Andrea Amati, and the elder of the two Brothers Amati) are not known for certain, being variously reported between 1540 and 1607 and 1555 to 1640. Sources such as Cozio report that the entire span of Antonio Amati's working life was 1588–1628. It is by all accounts a magnificent instrument, thought somewhat smaller than full size. It has been questioned whether "any Amati, no matter how fine, is sufficiently powerful for a solo cellist at the summit of his career. Baroque instruments of that period would not normally have the power of a later master." However, Shafran's recordings give no hint that the Amati has any lack of power. On the other hand, any Amati surviving into the present time has been rebuilt in the neck to allow for a higher bridge, and these alterations would give the instrument more carrying power and a brighter, more piercing sound than it had in the original baroque setup. The use of metal strings at high tension would also add to the brighter sound.