Richard Mille is famous for its limited edition timepieces, often produced in very small quantities. These exclusive models, such as the RM 56-02 Sapphire, feature intricate designs and complex movements, making them highly sought after by collectors. The rarity and craftsmanship of these watches contribute to their high value and desirability. Richard Mille's limited editions are a testament to the brand's dedication to creating unique and exceptional timepieces.