Emilio Materassi (standing) gives advice to Diego de Sterlich sitting in his Diatto, entry #23 (hardly visible) at Montenero outside Livorno on 16 September 1925.  Sterlich got 4th place and Materassi WON the game.<a rel="nofollow" class="external autonumber" href="http://www.kolumbus.fi/leif.snellman/gp2510.htm">[1]</a>
Unknown photographer
<a rel="nofollow" class="external autonumber" href="http://www.circuitodelmontenero.it/5/images/1925_foto_A004.jpg">[2]</a>