I'm no Olmo expert, but I can tell you at least a little bit while we wait for others to chime in.

The SunTour Radius downtube shifters date from 1990-1992, according to Velobase.

That particular head badge with the Olympic rings came into use during the 1980s, again according to Velobase.

Although we can't see the make/model specifics, the brakes and crankset look relatively modern. They wouldn't look out of place on a 1990-ish bike. The "aero" brake levers, with cables routed under the tape, also fit that time period. Those became commonplace in the mid/late 1980s.