Seiko 4R35

The Seiko 4R35, also known as Cal. 4R35, is an automatic mechanical movement developed and produced by Seiko. This caliber serves as a foundational component in a range of Seiko timepieces, providing essential timekeeping functions through its self-winding mechanism. The 4R35 operates as an automatic movement, meaning it harnesses the natural motion of the wearer's wrist to power its mainspring, eliminating the need for manual winding under regular use. It incorporates 23 jewels, which are synthetic rubies strategically placed at points of high friction within the movement. These jewels reduce wear on metal components, contributing to the movement's longevity and consistent performance. The oscillating balance wheel beats at a frequency of 21,600 vibrations per hour (vph), which translates to 3 Hz. This frequency results in the seconds hand advancing in six small steps per second, creating a relatively smooth sweep across the dial. When fully wound, the Cal. 4R35 offers a power reserve of 41 hours. This specification indicates the duration the movement can continue to operate accurately when not being worn or wound. A power reserve of 41 hours allows the watch to be set aside for over a day and a half without stopping, provided it was fully wound beforehand. The movement features several complications, including hours, minutes, and seconds, which are fundamental for displaying the current time. Additionally, it incorporates a date complication, providing the current day of the month, a practical feature for daily reference. The Seiko 4R35 caliber powers a variety of watches across different collections. It is found in models such as the Seiko Prospex Land SRPA75K1 Stainless Steel / Black / Strap (Ref. SRPA75K1), a 42mm timepiece. Other watches utilizing this movement include the Seiko Prospex Sky SRPB57K1 Stainless Steel / Black (Ref. SRPB57K1) and the Seiko Prospex Sky SRPB59K1 Stainless Steel / Cream (Ref. SRPB59K1), both measuring 44.7mm. The Seiko Prospex Sky SRPB61K1 Stainless Steel / Black (Ref. SRPB61K1), also 44.7mm, also houses the 4R35. Furthermore, the Seiko Prospex Diver Samurai Stainless Steel / Orange / Bracelet (Ref. SRPB97), with a 43.8mm case, is equipped with this movement. The consistent application of the 4R35 across these models underscores its role as a reliable and functional engine for Seiko's diverse offerings.

Specifications

Complications

Also Known As

Watches Using This Caliber(17)

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