SEIKO (SII) 7S26/NH35/NH36 Date Indicator Driving Wheel #0802183

Product Description

The SEIKO (SII) 7S26/NH35/NH36 Date Indicator Driving Wheel (#0802183) is a genuine Japanese-made component for Seiko 7S26, NH35, and NH36 automatic movements . As a key part of the calendar mechanism, this driving wheel transmits power from the movement to advance the date wheel, ensuring the date changes correctly at midnight and the date alignment in the window is accurate . As an original factory part, it is the ideal choice for replacing worn or damaged date driving wheels to restore proper calendar function.

Features & Function

• Genuine Seiko/SII part – authentic Japanese-made component for 7S26, NH35, and NH36 movements 

• Calendar mechanism component – drives the date wheel for accurate date display

• Wide compatibility – fits 7S26, NH35, NH36, and related 4R calibers

• Direct replacement – drop-in replacement for worn or damaged date driving wheels

Specifications

• Part Number: 0802183 

• Compatible Movements: Seiko 7S26, 7S36, NH35, NH36, 4R35, 4R36, and related calibers 

• Movement Family: 7S / NH Series

• Movement Frequency: 21,600 vph (3 Hz) – NH series / 21,600 vph – 7S26 

• Jewels: 24 (NH) / 21 (7S26)

• Power Reserve: >41 hours (NH) / ~40 hours (7S26) 

• Hacking: Yes (NH) / No (7S26)

• Hand-Winding: Yes (NH) / No (7S26)

• Origin: Japan 

Applications

• Service and overhaul – replacing worn or damaged date indicator driving wheels in 7S26/NH series movements

• Calendar function restoration – resolving issues with date alignment, incomplete date changes, or date not advancing

• Movement upgrade – replacing the date driving wheel during 7S26 to NH36 conversions

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine Seiko/SII part?

Yes, this is a genuine Seiko (SII/TMI) factory part made in Japan. The part number 0802183 is listed in official Seiko technical documentation for 7S26 and 4R calibers as the date indicator driving wheel .

2. Which movements is this date driving wheel compatible with?

This date driving wheel is compatible with Seiko 7S26, 7S36, NH35, NH36, 4R35, 4R36, and related calibers . The 7S26 and NH series share similar calendar architectures, making this wheel interchangeable across these movements .

3. What are the signs that the date driving wheel needs replacement?

Common signs include date not advancing at midnight, incomplete date changes, misaligned date display, or visible wear/damage during inspection. A qualified watchmaker can diagnose these issues.

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