SEIKO (SII) 7S26/NH35/NH36 Day-Date Corrector Wheel #0737183

Product Description

The SEIKO (SII) 7S26/NH35/NH36 Day-Date Corrector Wheel (#0737183) is a genuine Japanese-made component for Seiko 7S26, NH35, and NH36 automatic movements. As a key part of the calendar mechanism, this wheel engages with the crown when pulled to the first position, enabling the quick-set correction of both the day and date displays. This brand new original part is essential for watchmakers restoring proper calendar quick-set function when the original corrector wheel becomes worn or damaged.

Features & Function

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

• Calendar mechanism component – enables quick-set correction of day and date via the crown

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

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

Specifications

• Part Number: 0737183 (also listed as 737183)

• Compatible Movements: Seiko 7S26, 7S36, NH35, NH36, NH37, 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 day-date corrector wheels in 7S26/NH series movements

• Calendar function restoration – resolving issues with day/date quick-set adjustment

• Movement upgrade – replacing the corrector 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 0737183 is listed in official Seiko technical documentation and is widely recognized as the day corrector wheel for 7S26 and NH36 family movements .

2. Which movements is this corrector wheel compatible with?

This corrector wheel is compatible with Seiko 7S26, 7S36, NH35, NH36, NH37, 4R35, 4R36, and related calibers . It works with the day-date quick-set mechanism on both older 7S series and newer NH/4R series movements .

3. What are the signs that the corrector wheel needs replacement?

Common signs include the day or date not advancing when the crown is turned in the first position, irregular calendar changes, or visible wear/damage during movement inspection. The NH36 uses a two-position crown system: position 1 for day/date quick-set, and position 2 for time-setting with hacking .

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