- The SEAT factory in Martorell, which this year celebrates its 25th anniversary, reached another milestone in 2018 by exceeding the figure of 10 million vehicles produced. In the past quarter century, 39 different models have rolled off the production lines of Spain’s largest car factory, ranging from the second generation SEAT Ibiza and the first SEAT Cordoba to the SEAT Arona or the Audi A1, which is now into its first few weeks of production.