Seiko yoke spring – No. 388820 (1 piece) – for Seiko Sportsmatic Calendar 620 & Seiko Deluxe

Original Seiko setting lever spring/pawl spring for the hand-setting mechanism. Still in its original Seiko workshop packaging. Rare vintage spare part for early Seiko automatic movements.

Details:
• Original part number: 388820
• Function: Setting Lever Spring
• Use in: Seiko Sportsmatic Calendar 620 (スポーツマチック・カレンダー620) and Seiko 5 Deluxe
• Material: Steel
• Condition: NOS – New Old Stock (unused, stored for decades, packaging shows signs of age)

Compatibility (factory family):
➤ Seiko Sportsmatic Calendar 620 series – early automatic calibers of the 1960s (e.g. 6201, 6205 etc.)
➤ Seiko 5 Deluxe 

A notice:
This part is essential for the switching and winding mechanism (position "point setting"/"winding"). NOS parts for the early 620 caliber family are extremely difficult to find today.