Those Veloce brakes were only for 1995, when Mirage and Avanti were indroduced.Here are my Chorus "monos". What @SteelNipple referenced for the spring retainer is correct.
Not sure of they are 1st or 2nd gen. though; bike c.'92. The Veloce are probably early version after change in design when Mirage was first started; but both had cheap plastic covers instead of cone nuts. These are factory painted versions. Athena alsot a monoplanar design at some point (probably when Chorus went dual pivot, Athens just a rebadge?).