Even for the murky world of Colnago and associated brands that's something of an oddity. The seat lug cluster with the shot-in stays is similar to that used by Colnago in the 1990s but by that time Saronni frames were made by Tecnotrat - if they were still being made at all. The tubing decal says Tretubi Aelle but I've never seen crimped Aelle. However, there is some suggestion (no proof though) that some of the latter lower-spec Colnago built Saronni frames were built to look like Colnago Supers but with three tubes of Aelle. Saronni's 1982 World Championship Super had two crimps in the top and down tubes but the frame pictured appears to have 4 in the seat tube too.
Has it got a frame size stamped under the bottom bracket shell? A picture of the cable guides under there too would be useful.