The artist signed only a handful of his works, such as Judith and Holofernes, and Prophet Habakkuk. If confirmed, the bust would be just the eighth work by Donatello that is known to have been signed.
The signature appeared to match those on seven other Donatello works, including Judith and Holofernes (1457–64) at the Palazzao Vecchio in Florence, Italy. CECILIAE GONZAGAE SM-7156 by The Spiš ...