It has a Columbus repaint decal, so those brake cable tunnels and bottle bosses are suspect, especially given that the shift levers are clamp style. For me, the most significant feature are the long, non-Portacatena dropouts. Typically, on a high grade road bicycles, this means pre-1978. It has higher grade workmanship than I typically see on their lower mid-range Falck models and, based on those dropouts, it's likely too early for Aelle. Consequently, I suspect this is one of the 2xxx models and either tretubi SL or full SL. Generally, frames this small aren't SP but we can confirm via the seat post size. The presence or absence of helical ridges inside the bottom of the fork's steerer tube will tell us if it's tretubi or not.