I went back and looked up some late 1980s road tests. The president of Corso bicycles was Louis Corso, the son of Salvatore Corso, who had owned Stuyvesant. The latter entity was officially dissolved on December 19, 1986 and at that time Louis had been vice-president of Stuyvesant. The transition from Stuyvesant to Corso has continuity of brands, location and family. It appears to have been a name change for financial and/or legal purposes.