Have a look at this Japanese website: http://members.jcom.home.ne.jp/my_bianchi/index.html (there is an underline _ between my and bianchi) and click on "Catalogs of Bianchi" then click on "1990" and you will see a BRAVA model.

Its not a very good image but it is listed there. I think your deep red colour is original even though the catalogue only presents the various models in Celeste. Have a look at the previous catalogue and you will see a similar coloured bike.

This doesn't mean your frame is 1990 but it's a starting point.