Sigma Motor Corporation

The Sigma Motor Corporation was a South African motor vehicle assembler and distributor. It operated under the Sigma name until 1985 and was based in Silverton, Pretoria. Among the vehicles sold were various models of Mazda, Mitsubishi, Peugeot and Citroën.

The Silverton Assembly Plant was originally built in 1961 for Chrysler, and assembled Chrysler Valiants. At some time it operated under the name of Amcar. Chrysler sold its 25% shareholding in January 1983 with the remaining shares being held by Anglo American. Sigma was briefly merged with British Leyland's South African filial in 1979 but the deal fell through almost immediately, leaving Leyland South Africa without a dealer network.

Peugeot and Citroën South Africa (PACSA) was taken over by Sigma in early 1979 and french car production was brought to their "Sigma Park" plant east of Pretoria. Sigma's Mazda and Peugeot light commercials were briefly assembled by Sigma Leyland at Blackheath, Cape Town.

Sigma made great efforts to develop local models, not sold elsewhere in the world. In their first three years, they developed three such models: the Mitsubishi-engined Mazda 323 GLC 1.6, the luxurious Chrysler L-series, and the 2.6-litre Colt Galant. Sigma also sometimes had to choose between Mitsubishi and Mazda products, since the market was limited and local content laws made small production runs uneconomical. For instance, the second generation Mazda Capella was never offered in South Africa, as Sigma chose to build the Colt Galant instead.

It is unclear what models were actually assembled at the Silverton Assembly Plant. Some models may have been imported rather than locally assembled. In 1982, models listed for sale were:

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