Very distinctive 711 was the second Formula 1 car produced by Macrh Engineering. The design was radically changed comparing to the 1970 March 701. The 711 had side-mounted radiators and inboard front brakes, although been moved outboard later in the season. But the ,most distinguished feature of the car was aerodynamics developed by Frank Costin. The very large elliptic front wing described as the Spitfire (for its shape) or “tea-tray” (for its elevation from the car), high cockpit sides merging into a head fairing, full engine cover and rear airfoil make the car very aerodynamically efficient. STP Corporation disbanded its own team, but continued to support the works team. Ronnie Peterson was signed as the principal driver of STP March Racing Team. Swedish driver demonstrated excellent performance. He took no wins, but finished second on four occasions, ending as runner-up in the World Championship. Most exciting race of the season was the Italian Grand Prix at Monza. The first five cars were all covered by 0.61s. It was the closest finish in the history of the World Championship and the fastest ever race, with an average speed of 242.615 km/h. Peterson on March 721 was second at Monza. Distinctive front airfoil was not used at this circuit because of its probable instability at very high speeds.
| Season | Series | Event |
| 1971 | F1WC | Italian GP |
| Driver | No. | Entrant |
| Ronnie Peterson | 25 | STP March Racing Team |
| Scale | Manufacturer | Collection |
| 1:43 | RBA Collectibles / IXO | RBA / Fabbri Auto da Corsa i Miti Della Formula 1 |
| Cat. No. | Quality | Rarity |
| No. 24 | 
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