Joint-stock company with Edward Jaeger

In the early 1920s, Cartier established a joint-stock company with Edward Jaeger, who was associated with Jaeger-LeCoultre, to create watch movements exclusively for Cartier. This partnership marked a strategic move for Cartier, allowing the brand to have greater control over the quality and design of its timepieces. While this collaboration focused on producing movements specifically for Cartier, the company continued to source movements from other prestigious manufacturers, including Vacheron Constantin, Audemars Piguet, Movado, and LeCoultre. This approach enabled Cartier to maintain a diverse range of high-quality watches, appealing to various segments of the luxury market. During this period, Cartier also began implementing a system of reference numbers for its watches. By stamping a four-digit code on the underside of a lug, Cartier introduced a method for identifying and cataloging its timepieces. This practice not only enhanced the brand's organization but also provided customers with a way to verify the authenticity and lineage of their watches. The joint venture with Jaeger and the introduction of reference numbers were pivotal in solidifying Cartier's reputation as a leader in the luxury watch industry, showcasing its commitment to craftsmanship and innovation.