One of the 4 cars of the Martinelli Sonvico Racing Team was used in a few races by Guglielmo Bellasi.
Last race for M&S 04.09.1966 Trofeo AGIP in Monza as F3 with Clay Regazzoni (Instead of Silvio Moser).
With the follow result.
The chassis without engine was purchased by Fredy Amweg CH, repaired and equipped with a 1.6l Lotus Ford. This car he had in use up to the sale 1971 to Hans Obrist CH.
Unfortunately, I could not find any further details about the remaining of this car.