The frame most likely started life as a '80-'81 Super Corsa or Super Leggera model, or sold as a bare frameset as a Specialissima (all three would have been the same frameset). It is the top model Reparto Corse frame. They are truly fantastic riding frames, in my opinion.
I am almost positive that yours has been re-painted at some point. The down-tube decals are for an '83 up, the blue fill on the "B's" and stay top lettering is missing and the top-tube cable guides were originally detailed in black paint.
I need to see a clearer photo of the top of the rear brake bridge, but from what I can see it looks like the 1980 version without the "box" section around the brake hole.
As a Super Corsa it would have built with a full Super Record Gruppo with Ti axles, alloy FW, and pantographed Record post, TTT stem, and Alamarc leather wrapped bars. The brake levers and calipers were also custom milled.
The Super Leggera would have been the same but with without the Ti parts and alloy FW.
Either came with Mavic OR10 gold rims.
Truly a stunning bike in its day!
If there is no clear coat over the decals on your bike I would remove them and use the proper early 80's set available from cyclomondo on ebay. Then start looking for the panto pieces and Super Record parts.