Antonio Ascari in the centre (with "Alfa Romeo" sweater). To his right in front is Giuseppe Campari (with his small moustache). Possibly at Italian GP at Monza on 19 October 1924 (in which case Ascari won an Campari was 3rd). The other people are unknown, probably Alfa Romeo team affiliates.
Unknown photographer
<a rel="nofollow" class="external autonumber" href="https://www.pinterest.es/pin/359795457706585060/">[1]</a>