1935 model Maserati 4C 1100, probably s/n 1124.  Unknown race and people.  If it is Mille Miglia, it is 9 April, possibly drivers Gildo Strazza (entry #20),<a rel="nofollow" class="external autonumber" href="https://www.bonhams.com/auctions/14487/lot/172/">[1]</a> since Romano (entry #23) has a slightly different radiator detailing. There were several similar Maserati 4CS in that race.<a rel="nofollow" class="external autonumber" href="https://www.racingsportscars.com/results/Mille_Miglia-1935-04-14.html">[2]</a>
Unknown photographer
<a rel="nofollow" class="external autonumber" href="https://images1.bonhams.com/image?src=Images/live/2006-04/18/7247251-21-3.jpg&amp;width=960">[3]</a>