A Brief History of the Marque
Built in Bergamo 1952-1957
Made bicycles, motorcycles and mopeds. The firm was acquired by by Bianchi.
1962-1963 3-speed two-stroke 48cc Super Sport
1970 Chiorda SS Mirage 50cc, Commando 50 and 1971 GT, 72 Mirage, most if not all with Minarelli engines, however several sources mention them being fitted with Morini Franco engines.
1972 Chiorda MO Gyromat 48cc.
These were probably built when Bianchi owned the the Chiorda brand.
Ozebook has an entry on this marque
Sources: Henshaw, et al