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This is a winding stem designed for TMI (Time Module Inc.) / Seiko VJ series quartz movements, specifically for date function models. The VJ series is TMI‘s slim quartz movement line, covering sizes from 6¾X8‴ to 12½‴, featuring 3-hand with date display, and offering various hand heights and stem length options.
This winding stem is the critical component connecting the crown to the movement, used for time setting and quick date adjustment, and is suitable for VJ series movements such as the VJ42 .
| Feature | Description |
|---|---|
| Compatible Brand | TMI / Seiko |
| Compatible Series | VJ series quartz movements (VJ42, etc.) |
| Function Support | 3 hands (hours, minutes, seconds) + date display |
| Primary Use | Connects crown to movement for time setting and quick date adjustment |
| Design Feature | VJ series offers various stem length options for different case thicknesses |
| Compatibility | Suitable for date function VJ series movements |
TMI VJ Series Technical Background:
| Parameter | Value |
|---|---|
| Movement Type | Quartz |
| Size Range | 6¾X8‴ – 12½‴ |
| Thickness | Approx. 2.71 mm (e.g., VJ42) |
| Battery Life | Approx. 3 years (using SR621SW battery) |
| Functions | Hours, minutes, seconds, date |
| Instruction | Details |
|---|---|
| Normal Operation | Pull crown to first position for date setting, second position for time setting |
| Quick Date Change | Avoid quick date change between 9 PM and 3 AM to prevent damage to the calendar mechanism |
| Time Setting | When setting time, rotate hands clockwise to avoid gear damage |
| Battery Replacement | Replace battery every 3 years (use SR621SW) or when timekeeping becomes abnormal |
1. Remove Old Stem:Remove the movement, press the setting lever while pulling out the old winding stem
2. Inspect Movement:Check the setting lever, winding pinion, and clutch wheel in the movement for damage
3. Cleaning:Clean the winding stem mounting hole in the movement to remove old oil and debris
4. Insert New Stem:Insert the new winding stem into the movement, gently rotate until a “click” indicates it is locked in place
5. Test Functions:Pull and push the stem to test proper engagement in all positions (winding, date setting, time setting)
6. Attach Crown:Screw or press the original crown onto the stem (depending on crown type)
7. Final Test:Reinstall the movement into the case and test all functions
| Aspect | Guidance |
|---|---|
| Inspection Period | Check the winding stem for corrosion, bending, or wear during each battery replacement |
| Wear Indicators | Replace the stem if it shows stripped threads, bending, corrosion, or thread wear |
| Cleaning Method | Gently wipe with isopropyl alcohol; do not soak. Avoid corrosive cleaners |
| Lubrication | Microscopic lubrication may be applied to contact points using professional watch oil |
| Storage | Store unused stems in a dry, dust-free environment to prevent oxidation |
Q1: Which TMI/Seiko movements is this winding stem compatible with?
A: This winding stem is designed for the TMI/Seiko VJ series quartz movements with date function, including the VJ42 and other VJ series calibers. The VJ series covers sizes from 6¾X8‴ to 12½‴ .
Q2: What is the difference between this and the original Seiko stem?
A: This is a generic (aftermarket) replacement part. It is designed to meet the specifications of the original VJ series winding stem but is not manufactured by Seiko/TMI.
Q3: Can I install this stem myself?
A: If you have experience with watch repair and proper tools, you can install it. However, due to the precision required, professional installation is recommended for those without experience.
Q4: How do I remove the old winding stem from a VJ series movement?
A: Locate the setting lever (a small push-button or tab on the movement). Gently press it while pulling the stem outward. Do not force it – if it doesn‘t release, you may be pressing the wrong lever.
Q5: What should I do if the stem does not click into place?
A: Remove the stem, check for debris or damage, and try again. Ensure you are pressing the setting lever correctly. If it still won’t lock, the movement or stem may be damaged.
Q6: What is the battery life of VJ series movements?
A: VJ series movements, such as the VJ42, have a battery life of approximately 3 years when using an SR621SW battery .
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