The Wostok 2809A is a highly regarded mechanical wristwatch movement produced by the Chistopol Watch Factory (Wostok) starting from the late 1950s. It is a manual winding movement with 22 jewels known for its precision and reliability. Inspired by the legendary Zenith 135 chronometer movement, the 2809A stands out due to its quality design and engineering, offering a classic and durable watch mechanism.
Key highlights of the Wostok 2809A movement include:
Size and Dimensions: The caliber is 12 1/2 ligne (approximately 28.0mm diameter) and 4.85mm in height.
Frequency: The movement runs at 18,000 vibrations per hour (A/h).
Jewels and Suspension: It contains 22 jewels and is equipped with two Russian in-house shock protection systems named Poljot.
Balance and Regulation: Features a Glucydur screw balance with a Breguet hairspring that has an end curve, adjusted through a long regulator arm with fine-tuning on a curved cam mechanism.
Unique Gear Train: The gear train setup is unusual, inspired by Zenith 135, utilizing a mainspring barrel that drives the second wheel, then a double third wheel, fourth wheel, and escape wheel. The center seconds pinion is driven indirectly, providing friction-free driving of the central seconds hand without needing a friction spring.
Functions: The movement performs stem wind and set operations with sub-second display.
Accuracy Expectations: Theoretically, the movement can achieve deviations of -10 to +5 seconds per day, though many specimens tend to run slower in practice. It lacks a movable stud for hairspring positioning.
Aesthetic Details: The screws on the balance wheel are evenly spaced, possibly more for aesthetic reasons than precise balancing, and the hour wheel has an unusually high number of teeth.
Technical Characteristics: Lift angle is 44°, clockwise hairspring direction, and cam-style adjust mechanism.
Durability and Legacy: This caliber is considered one of the most accurate and highest-quality wristwatch movements of Russian production in its era and underwent professional servicing to maintain good timekeeping.
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Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
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