Probably one of the later Zeus bicycles made. I don't think they made them much longer after this. I have tentatively dated this to around 1981. Everything is Zeus or Spanish except for the rims (were there any rims made in Spain?) and the stem(Cinelli). Frame is Reynolds 531 Special Lightweight.
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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