This model is attributed to Louis Chiron but there is no record of him running #24 during the 1928 Grand Prix season. Car numbers could not be found for Germany (6th) or Spain (1st). Searches on 1927 and 1929 also failed to find him using the number.
Two Bugatti 35 did use the number in 1928.
Although online sellers like to claim that all Altaya are Ixo, this is an Eligor and Brumm is also known to be used.