this is the base model called the Special. lugset is Agrati "BRIANZA."

have had three of them come through.

Peter Brueggeman should be along shortly with additional information for you, including a dating estimate.

in the interim you may wish to explore his Olmo page:

Olmo, Peter Brueggeman

Olmo Serial Number Registry, Peter Brueggeman

hint: she is a good deal earlier than "early '70's."