Politoys project was one of the many reincarnations in the beginning of Frank Williams Racing Cars journey in F1. In 1972 Williams received a sponsorship support from the French motor oil Motul company to buy a new March 721 for Henri Pescarolo, who drove for Williams for the second season. In the same time, an agreement with the Italian toy manufacturer Politoys allowed to invest in the designing of the in-house Williams chassis. The car christened Politoys FX3 and designed by Len Bailey was a conventional Cosworth-engined car with a Hewland FG400 gearbox. The FX3 was ready for the British Grand Prix, but on its debut race in the hands of Pescarolo, the car crashed because of steering failure and was heavily damaged. Pescarolo returned back to March 721, and FX3 appeared again just once driven by Chris Amon in the end of season non-Championship 1972 World Championship Victory Race at Brands Hatch. For the 1973 season the FX3 was reworked, renaimed as Iso–Marlboro FX3B, and used for the first three races of the 1973 season being replaced with the new Iso-Marlboro IR.
| Season | Series | Event |
| 1972 | F1WC | British GP |
| Driver | No. | Entrant |
| Henri Pescarolo | 24 | Team Williams Motul |
| Scale | Manufacturer | Collection |
| 1:43 | IXO | Formula 1 Auto Collection |
| Cat. No. | Quality | Rarity |
| No. 135 | 
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