Model Variants (Including Prototypes)
Z.506 - Base Series Designation; original one-off prototype model.
Z.506A - Civilian variant
Z.506B - Military variant; deeper fuselage; provision for comventional drop bombs or single torpedo; raised cockpit deck.
Z.506S - Dedicated at-sea rescue variant
Z.506 (Landplane) - One-off seaplane converted to landbased role for endurance record.
Z.509 - Dimensionally larger variant of the Z.506 for Ala Littoria lines; three examples produced.