Seiko 6R35

Powering a range of timepieces from the renowned Japanese manufacturer, the Seiko 6R35 movement, also known as Cal. 6R35, is an automatic caliber developed by Seiko. This self-winding mechanism is designed to provide reliable timekeeping and functionality for wristwatches, converting the wearer's motion into energy to wind the mainspring. The 6R35 operates with 24 jewels, which are synthetic rubies strategically placed at points of high friction within the movement. These jewels serve to reduce wear on metal components, thereby enhancing the movement's longevity and accuracy over time. Its oscillation rate is 21,600 vibrations per hour (vph), which translates to a frequency of 3 Hz. This frequency dictates the smooth sweep of the seconds hand, causing it to advance in six small steps per second. A frequency of 21,600 vph represents a balance between precision and power efficiency, often contributing to extended power reserves. One notable characteristic of the 6R35 is its substantial power reserve of 70 hours. This means that a watch powered by this movement can be removed from the wrist and remain running for nearly three full days before requiring manual winding or further wear. This extended power reserve offers practical convenience for the wearer, reducing the frequency with which the watch needs to be reset if not worn daily. With a diameter of 27.4 mm, the movement is sized to fit a variety of watch cases, allowing for its integration into diverse watch designs. In terms of functionality, the Seiko 6R35 includes several complications. It displays hours, minutes, and seconds, providing the fundamental elements of timekeeping. The seconds hand allows for precise timing measurements. Additionally, the movement incorporates a date complication, which indicates the current day of the month through an aperture on the watch dial. This feature offers practical utility for daily planning and organization. The 6R35 is found in several Seiko Prospex Diver models, including the Seiko Prospex Diver 1970 Mystic Lagoon (Ref. SPB288), the Seiko Prospex Diver 1970 Stainless Steel / Grey - Brown / NATO (Ref. SPB237), the Seiko Prospex Diver 1970 Stainless Steel / Green (Ref. SPB153), the Seiko Prospex Diver 1970 Stainless Steel / Blue / Bracelet (Ref. SPB183), and the Seiko Prospex Diver 1970 Scuba Helly Hansen (Ref. SBDC181), all of which feature a 42.7mm case size.

Specifications

Complications

Also Known As

Watches Using This Caliber(8)

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