Luigi Musso in  Maserati A6GCS/53 at Giro Automobilistico dell'Umbria on 6 June 1954. He ends in 2nd place.<a rel="nofollow" class="external autonumber" href="https://www.racingsportscars.com/results/Giro_dell_Umbria-1954-06-06-6100.html">[1]</a>  Musso owned s/n 2043, so I guess it was that car.<a rel="nofollow" class="external autonumber" href="http://www.barchetta.cc/english/All.Maserati/Detail/2043.A6GCS.htm">[2]</a>  This race was held 1948 to 1992,<a class="external autonumber" href="https://it.wikipedia.org/wiki/Giro_Automobilistico_dell%27Umbria">[3]</a> and was known as the Coppa della Perugina in the late 1920s.
Unknown photographer
<a rel="nofollow" class="external autonumber" href="https://thegoodnaturedfink.files.wordpress.com/2016/01/2086-2-fantuzzi-spyder-body-requested-by-pietro-palmieriorig-2057-chassis1.jpg">[4]</a>