Genuine Seiko pawl spring (1 piece) – Part 382620 (コハゼバネ) for Grand Seiko

This extremely rare original Seiko ratchet spring is an essential component for the restoration of early mechanical Seiko calibers. The spring securely holds the winding ratchet in position and prevents the mainspring barrel from rewinding – a small part with a big function.

The spare part bears the official Seiko part number 382620 and comes from historical factory stock (NOS – New Old Stock).

Compatible Seiko calibers and models

This spring has been demonstrably used in several high-end and now highly sought-after calibers, including:

• Grand Seiko First (Cal. 3180)
• Grand Seiko 3140A
• Seiko Lord Marvel (early hand-wound versions)
• Seiko Crown / Crown Chronograph (platform caliber 57xx, including 5717 / 5719)
• Other early mechanical Seiko calibers from the same movement family from the 1960s

This makes this part ideal for restorations of Grand Seiko icons , early haute horlogerie models from Suwa Seikosha, and rare chronographs from the 1960s.

Condition

• NOS – New Old Stock
• Unused, original from historical Seiko workshop stock
• A rare opportunity to acquire an authentic spare part from the early days of Grand Seiko.

Technical designation

• Japanese:コハゼバネ (Kohaze-bane)
• German: pawl spring
• Seiko Part No.: 382620