My Primato has a webbed BB...they stopped doing it at some point because of cost. I'm not sure when the cut offs are. There are neo-Primatos made at later dates which I think used other tubing, so I think the answer depends on when it was made. One member had a De Rosa labeled Primato that was TSX, but I think the group consensus is that it wasn't a Primato. I've only seen one Diamanté, and it looked like a Primato. If there was a difference, I didn't see it.

The professional was SL or SLX...not oversized. I think some later ones used TSX. They're probably still making them, but I don't know what tubing they'd use. Up until the 90s there was only one model - a De Rosa. Some called them professionals, or giro d italias...but they're De Rosas.

Primatos don't come up much and they aren't cheap. The Primato is probably the most iconic 90s steel frame, other than an MXL. Professionals are easier to find.