The March 721, designed by Frank Costin, was the successor model to the March 711. It was built in three versions: the traditional 721, the 721X, and the 721G. The basic version of the 721, which did not have an additional designation in the form of a letter, was primarily designed for customers such as Frank Williams. The March 721X, on the other hand, was intended for the factory team. The 721X had the monocoque of the basic 721, but the rear springs were highly hinged and could be operated via levers and springs. The main idea of the design was to create a low moment of inertia by concentrating most of the car’s weight in the middle of the car. There was nothing wrong in theory, but the Goodyear racing tires that March used in 1972 never really harmonized with the chassis. The front tires were constantly being overloaded, causing oversteer and understeer. Niki Lauda was in his first full season in F1, after a single debut race for works STP March Racing Team in 1971. Niki started the season with the 721 in the first two races, then switched to 721X. But as the car was the failure, after Belgian Grand Prix March replaced the 721X with 721G version. For the 721G, a conventional Formula 2 chassis from the March 722 was adapted for Formula 1. Suspension and brakes were from the customer version of the 721, and the powerplant was again the Cosworth DFV V8 engine. The 721G handles much better, but anyway still not enough for Lauda to score his first points.
| Season | Series | Event |
| 1972 | F1WC | Belgian GP |
| Driver | No. | Entrant |
| Niki Lauda | 12 | STP March Racing Team |
| Scale | Manufacturer | Collection |
| 1:43 | Spark | |
| Cat. No. | Quality | Rarity |
| S7165 | 
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