For reference some details from my original mid 80s Superissimo SLX (I sold this bike some time ago):
Note pump peg and fork crown.
Not panto on top of BB shell.
Seat stay shape is similar but COLNAGO instead of clover.
Bottom bracket the same.
SLX frame, braze on fd mount, two sets of bottle cage brazeons.
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70 Pogliaghi ItalCorse, 72 De Rosa, 72 Masi Gran Criterium, 75 Masi Gran Criterium, 77 Melton, 79 Bianchi Super Leggera, 79 Gios Super Record, 81 Picchio Special, 82 Guerciotti Super Record, 82 Colnago Profil CX, 83 Colnago Superissimo, 84 Fuso