Kool Derosa!
Measuring the diameter of the tubes will tell you if it's OS or not...!
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A good buddy of mine has a Primato sitting in his garage, an EL-OS. It's from the 90's & in like new cond. Replete w/ C-record Ergo. Another friend of our's gave it to him to hold onto cause his wife was a total nag about bikes & biking. They're both attorney's
It was bright red. He never bothered to come back & reclaim the bike, so my friend had it re-painted Pearl White by Joe Bell & there it has sat for all this time & hasn't ridden it since......lol! I think it's 59 cm. I believe he had it painted white because he already had a red Merckx. I think I need to go bug him...