Re-engined with a 640 kW (860 hp) Hispano-Suiza 12Ycrs and armed with a 20 mm (0.79 in) Hispano cannon and 2 × 7.5 mm (0.30 in) MAC 1934 machine guns in the wings. Its first flight was on 14 August 1934, 120 built.
D.510 built for Britain for evaluation - 1 built.
D.510 built for China - 24 built.
D.510 built for Japan for evaluation - 1 built.
D.510 built for Russia for evaluation - 1 built.
D.510 built for Turkey - 12 built but deliveries halted by embargo.