No, this isn't a high end frame. The relevant characteristic are the stamped rear dropouts that require a rear derailleur with a claw adapter. By the time of the Piaggio era (1980-1984) this type of dropout was pretty much restricted to entry level models. I would also expected a Piaggio era frame, to have brazed-on fittings for things like water bottle and shift levers, if it was mid-range or above.

I agree with the very early 1980s assessments.

Chiorda was a full range range, mass production manufacturer. They produced bicycles from entry level to professional racing models. They were one of the brands carried by the shop that I worked in and later managed, during the 1970s.