Hello CrowSeph,

Rizzato is Cesare Rizzato, the company which produced Atala, Lygie and Atlantica brand cycles. They are not a manufacturer of chainsets. A Rizzato marked chainset would have been manufactured by someone else. Your chainset appears to have been manufactured by Agrati.

The bicycle's headset looks to OFMEGA brand.

Fine research locating that Atala thread. Looks like you have an identification.