Columbus Cromor surfaced in the early 90's I think - it was previously called Matrix.

There should be a serial number underneath and on the side of the bottom bracket shell - sometimes they can fill up with paint and be hard to see.



Otherwise it may be on the fork steerer tube.

Keep in mind often serial numbers don't really help with much, but there is this Olmo serial number resource: Olmo Serial Number Dating Registry

Nice pick up. I wouldn't mind on Olmo in the shed.