After World War II, the company began making its own sports cars under the Siata brand until its eventual bankruptcy following the first Arab oil embargo in the mid-1970s.

[2] The Daina was based on heavily modified Fiat 1400 mechanics; the frame was reinforced and shortened while the engine was tuned by Siata.

The Barchetta Sport Spider was designed by Mario Revelli de Beaumont and built by Bertone and Rocco Motto.

Because of this the engine displacement increased to 903 cc with 47 hp (35 kW), and it gained disc brakes on the front wheels and a higher top speed of 125 km/h (78 mph).

Due to the 1973 oil crisis, sales of sports cars in Italy declined, forcing ORSA to end the production in spring 1975.

A 1500-cc Siata Daina driven by Dick Irish and Bob Fergus finished first in its class and third overall at the 1952 12 Hours of Sebring.