Don't know: might be one for BianchiGirl...the catalogs I can find show that Bianchi offered naked frames made of Ishiwata in '82 and '83, but they had better lugs and forks and the only one made of Magny was a touring frame...later catalog scans don't show any of the Japanese models as complete bikes, until one '86 but it's a Tange frame...this Sport SS has shown up before in the C&V pages, so if you search the archives you may find more info on it (black is the only color I remember seeing this model in).