De Sanctis was a Rome-based constructor, run by Luigi "Gino" De Sanctis and his son Lucio De Sanctis, that built single-seat racing cars for Formula Junior, Formula 850 and Formula 3 from a workshop on Via Arno. Its only sports car, the SP 1000, was developed from late 1963 to rival the Lotus 23-based car that rival tuner Giannini had fielded with driver Cesare Toppetti. The SP 1000's body was…