This is what I know about 6C 10814324.
My father, Petronio Barone (born in Caserta on January 24th, 1911 and died in Rome on June 15th, 2015) loved cars and speed, but he never raced. He was an officer at the Italian central bank (Banca d’Italia). He owned two Alfa Romeo 1750 6C. He bought (and sold) the first one in Rome (plate: Roma 32144). Here are some pictures, taken near Pola (Istria County, Croatia), where my father served in the Army as an artillery officer.
In 1937, he left to Addis Ababa (Ethiopia), where he bought 6C 10814324 (plate: ER 6393). Here are some pictures.
My father left 6C 10814324 in Addis Ababa when the English troops sent him to Kenya, in 1941.