The Columbus decal style indicates 1988 or newer. The fact that's it's CrMo but not Cyclex, should narrow it to Cromor, which was Columbus' butted tubeset for mid-range bicycles. Weight-wise, it slotted in between SL and SP, but was seamed. Cromor decals are usually silver and state Cromor but this could be a customized version with a Ciocc specific label. Certainly, 105 components would be typical spec for a Cromor frame.