First flown in November 1922, the D.1 was a modern fighter built largely of metal. The fabric-covered wing was originally mounted on the fuselage but raised on the D.1bis and ter to improve the visability for the pilot. Main customers were Italy, where a smaller variant was built as the Ansaldo AC.2, Yugoslavia and the French navy. Two D.1s, including this one, were delivered to Switzerland. C1 on the tailfin is a French code for a single-engined fighter. Photo from: ETH-Bibliothek Zürich