Tudor 390

A self-winding mechanism developed by Tudor, the Tudor 390 movement serves as a foundational automatic caliber. This movement is also recognized by its alternative designation, the Buren 1282, indicating its origin or close relation. As an automatic movement, the Tudor 390 is designed to harness the natural motion of the wearer's wrist to wind its mainspring, thereby eliminating the need for manual winding when worn regularly. The technical specifications of the Tudor 390 define its operational characteristics. It incorporates 17 jewels, which are synthetic rubies strategically placed at points of high friction within the movement. These jewels serve to reduce wear on critical components, contributing to the movement's longevity and consistent performance over time. The balance wheel of the Tudor 390 oscillates at a frequency of 19,800 vibrations per hour (vph), which translates to 2.75 Hertz. This frequency dictates the rate at which the balance wheel completes its back-and-forth motion, influencing the smoothness of the seconds hand's sweep across the dial. A frequency of 19,800 vph results in a visible progression of the seconds hand, marking its steps as it advances. In terms of power and dimensions, the Tudor 390 offers practical advantages. It provides a power reserve of 54 hours, meaning that a fully wound watch powered by this movement can continue to operate for over two full days when not being worn. This extended power reserve allows the wearer to remove the watch on a Friday evening and find it still running on Monday morning, without requiring a reset or manual winding. The movement measures 28.5 mm in diameter, a size that allows it to be housed within a range of watch cases. Its height of 3.25 mm contributes to the overall slimness of the watch, enabling the creation of timepieces that sit closer to the wrist. Collectively, the specifications of the Tudor 390 underscore its design as a functional and reliable automatic movement. Its self-winding nature, coupled with a practical power reserve, offers convenience for daily wear. The inclusion of 17 jewels supports its operational durability, while its specific frequency and compact dimensions define its mechanical profile and suitability for various watch designs. The Tudor 390, or Buren 1282, thus represents a robust automatic caliber within Tudor's horological offerings.

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