The attribution of this model—represented by an example on an inkstand in the Bargello, Florence—was made by Bertrand Jestaz. The Severo workshop produced two types of the Tobias: one, a small child, and the other, a slightly older and more elastic boy, as in this and the Bargello examples. The young voyager carries his bedroll on a stick slung over his left shoulder. The object in his right hand is probably a stringer, from which separately cast fish would have been suspended. The identification of the subject is assured by the Bargello inkstand, which shows the boy with fish (integrally cast) as well as with his companion dog.
[James D. Draper, 1984]
Footnotes:  B. Jestaz, "Une Statuette de bronze: Le Saint Christophe de Severo de Ravenna," La Revue du Louvre et des Musées de France 22, 5 (1972), pp. 77–78.