Premise: Brixia-Zust (originally Brixia-Züst) was an Italian car manufacturer founded by engineer Roberto Züst, owner of Zust company of Milan. The affiliated company was situated in Brescia, Northern Italy. (Brixia is the antique Latin for Brescia.) These companies are often confused. The company made racing cars that participated in Targa Florio, an open road race in Sicily.
Hypothesis: Brixia-Zust cars only were sold for racing.