I've tried to post a longer piece with multiple photos, but failed repeatedly. (Error message says I can't post URLs, but I'm not trying to include a URL in the message, just photos.)

Here are the basics:
Riggio road bike donated to Troy Bike Rescue during May. Model appears to be "California." Seems older than most of the Riggios posted here in the past - lugged frame with front triangle chromed under the paint, no braze-ons. Also, a different style seat cluster than bikes posted here in the past or shown in the catalog linked in a previous thread. (I won't list the catalog host site here, but will thank Mark Bulgier for it.) I'll add photos and more info if this thread actually posts to the forum.

Here's a blurry side view, note the chrome head lugs and antique-ish Cannondale rack. Late 1970s?

Everything's so faded that the logo is barely a shadow. Same style as on other Riggios I've seen posted here, but note the interlocking rings. Possible Olympic reference?

Seat-stay caps unlike other Riggio bikes posted here. Serial number style/placement matches a Viner we have in the shop now, but has "M" prefix.

Crankset and model name.