1. Product Overview
The SEIKO 5 Sports Automatic Grey Dial Men's Watch SRPE61K1 is a robust and stylish timepiece designed for everyday wear. It features a durable stainless steel case, a comfortable nylon strap, and is powered by a reliable automatic movement. This manual provides essential information for the proper use and care of your watch.
Key Features:
- Stainless Steel Case
- Nylon Strap
- Automatic Movement (Caliber: 4R36)
- 24 Jewels
- Hardlex Crystal
- Grey Dial with Analog Display
- Luminous Hands and Markers
- Day and Date Display
- See-Through Case Back
- Buckle Clasp
- 100M Water Resistance

Figure 1: Front view of the SEIKO 5 Sports Automatic Grey Dial Men's Watch SRPE61K1, showcasing its grey dial, luminous markers, and nylon strap.
2. Setup and Initial Operation
2.1 Winding the Mainspring
This watch is equipped with an automatic mechanical movement (Caliber 4R36) that is powered by the motion of your wrist. It also supports manual winding.
- To manually wind the watch, rotate the crown clockwise in the normal position (position 0).
- Wind the crown approximately 20-30 times to ensure sufficient power reserve for initial operation.
- The watch will also wind automatically with normal wrist movements while worn.
2.2 Setting the Time
- Pull the crown out to position 2 (second click). The second hand will stop.
- Rotate the crown to set the hour and minute hands. Ensure the AM/PM is correctly set by observing the day/date change around midnight.
- Push the crown back in to position 0 (normal position). The second hand will resume movement.
2.3 Setting the Day and Date
- Pull the crown out to position 1 (first click).
- Rotate the crown clockwise to set the date.
- Rotate the crown counter-clockwise to set the day.
- Push the crown back in to position 0 (normal position).
Important: Do not set the day and date between 9:00 PM and 4:00 AM, as this may damage the movement. If adjustment is needed during this period, first set the time outside this range, then adjust the day/date, and finally reset the time.

Figure 2: Side profile of the SEIKO 5 Sports Automatic watch on a wrist, highlighting the crown position and case thickness.
3. Operating the Automatic Movement
The Caliber 4R36 is a self-winding mechanical movement. It features 24 jewels and operates at 21,600 vibrations per hour (6 beats per second). The movement has a power reserve of approximately 41 hours when fully wound.
- Self-Winding: The watch is wound automatically by the natural motion of your arm while wearing it.
- Manual Winding: If the watch has stopped or its power reserve is low, it can be manually wound by rotating the crown clockwise in the normal position.
- Hacking Function: The second hand stops when the crown is pulled out to position 2, allowing for precise time setting.
Video 1: An official seller video providing a detailed review and demonstration of the SEIKO 5 Sports Automatic watch, including its features and operation.
4. Maintenance and Care
4.1 Water Resistance
Your SEIKO 5 Sports watch has a water resistance rating of 100 meters (10 BAR). This means it is suitable for everyday use, swimming, and snorkeling. It is not recommended for scuba diving or high-impact water sports.
- Always ensure the crown is pushed fully into position 0 before any contact with water.
- Avoid operating the crown or pushers while the watch is wet or submerged.
- After exposure to saltwater, rinse the watch with fresh water and dry it thoroughly.
4.2 Crystal and Case
The watch features a Hardlex crystal, which is resistant to impacts and scratches, but not entirely scratch-proof. The stainless steel case is durable and designed for longevity.
- Clean the case and crystal regularly with a soft, dry cloth to remove dirt and fingerprints.
- Avoid exposing the watch to extreme temperatures, direct sunlight for prolonged periods, or strong magnetic fields.
- Protect the watch from strong impacts or shocks.
4.3 Nylon Strap
The nylon strap is designed for comfort and durability.
- To clean the nylon strap, gently wash it with mild soap and water, then rinse thoroughly and allow it to air dry completely.
- Avoid exposing the strap to harsh chemicals or excessive moisture for extended periods.

Figure 3: Rear view of the SEIKO 5 Sports Automatic watch on a wrist, displaying the automatic movement through the transparent case back.
5. Specifications
| Feature | Detail |
|---|---|
| Brand | SEIKO |
| Model Name | SRPE61K1 |
| Movement Type | Automatic with manual winding capacity (Caliber 4R36) |
| Jewels | 24 |
| Power Reserve | Approx. 41 hours |
| Case Material | Stainless Steel |
| Case Diameter | 40mm |
| Case Thickness | 11.5mm |
| Crystal | Hardlex Crystal |
| Dial Color | Grey |
| Band Material | Nylon |
| Band Color | Gray |
| Clasp Type | Buckle (Tang Buckle) |
| Water Resistance | 100 Meters (10 BAR) |
| Luminous | Hands and Markers |
| Functions | Day/Date Display, Hacking, Manual Winding |
| Item Weight | 150 Grams |
6. Troubleshooting
6.1 Watch Stops or Runs Irregularly
- Insufficient Winding: If the watch is not worn regularly or for sufficient periods, the mainspring may not be fully wound. Manually wind the watch by rotating the crown clockwise 20-30 times.
- Lack of Movement: Automatic watches require wrist movement to stay wound. If you lead a sedentary lifestyle, consider manual winding or using a watch winder.
- Magnetic Fields: Exposure to strong magnetic fields (e.g., from speakers, smartphones, or certain appliances) can affect the watch's accuracy. If you suspect magnetization, consult a professional watchmaker.
6.2 Day/Date Not Changing Correctly
- Ensure the time is set correctly, especially the AM/PM cycle. The day/date mechanism typically changes around midnight.
- Avoid adjusting the day/date between 9:00 PM and 4:00 AM to prevent damage to the movement.
6.3 Water Intrusion
- If you notice condensation or water inside the watch, immediately take it to a qualified watchmaker for inspection and repair to prevent further damage.
7. Warranty and Support
Your SEIKO watch is covered by a manufacturer's warranty against defects in materials and workmanship. Please refer to the warranty card included with your purchase for specific terms, conditions, and duration of coverage.
- For warranty service or repairs, please contact an authorized SEIKO service center.
- Proof of purchase is typically required for warranty claims.
- Unauthorized repairs or modifications may void your warranty.

Figure 4: The SEIKO 5 Sports Automatic watch presented in its original packaging.