What Is the VH31 Movement?
The VH31 is a three-hand sweep-second quartz movement from TMI (Time Module Inc.). Unlike a conventional quartz movement that typically advances the seconds hand once per second, the VH31 moves the centre seconds hand four times per second, producing a noticeably smoother sweep that visually resembles a mechanical watch more closely.
The practical appeal is quartz convenience with a smoother-looking seconds hand. The specifications below separate the movement's operating characteristics from the size and capabilities of the finished watch.
VH31 Specifications at a Glance
| Detail | Specification |
|---|---|
| Type and display | Battery-powered quartz; hour, minute and central seconds hands |
| Seconds-hand motion | Four steps per second, in quarter-second increments |
| Accuracy | TMI lists less than ±15 seconds per month at normal temperatures |
| Battery | SR920SW |
| Estimated battery life | Approximately two years |
| Movement diameter | 23.70mm |
| Movement height | 3.45mm |
Source check, September 22, 2026: TMI's VH31 product information, VH31 specification sheet and VH sweep-second explanation. The linked specification sheet identifies VH31B; a watch listing that says only VH31 does not establish its A/B revision. The movement's 3.45mm height is not the thickness of the finished watch.
Looking for watches that use this movement? Explore our VH31 Watches collection, or use our Best VH31 Watches in 2026 guide to compare current sweep-second quartz dive, field, dress and tool-watch models by size and use case.
Key Features of the VH31 Movement
Here’s what makes the VH31 movement stand out:
Smooth Sweeping Seconds Hand
The VH31 moves its seconds hand four times per second instead of the typical once-per-second step of a standard quartz movement. This creates a smoother visual effect while maintaining the convenience of quartz.High Accuracy
TMI specifies VH31 accuracy at normal temperatures as less than ±15 seconds per month. Actual performance can vary with operating conditions.Low Maintenance
The VH31 uses an SR920SW battery, with TMI specifying an approximate battery life of two years.Practical Operating Specifications
TMI specifies an operating temperature range of -5°C to +50°C for the VH31, along with antimagnetic resistance of at least 1,600 A/m. As with any watch movement, overall durability and water resistance depend on the complete watch construction rather than the movement alone.Accessible Sweep-Second Quartz
The VH31 is widely used in affordable three-hand watches because it combines battery-powered convenience with a smoother-looking seconds hand. The movement alone does not determine the quality, durability or water resistance of the complete watch.
When the VH31 Makes Sense in a Dive-Style Watch
The VH31 can be a practical movement choice for a dive-style watch, but diving capability comes from the complete watch rather than the movement itself.
Smooth Seconds-Hand Motion
The four-step-per-second sweep gives the display a more fluid appearance than conventional one-step-per-second quartz. For elapsed-time tracking on a dive-style watch, the rotating bezel is the primary timing reference; the seconds hand is mainly useful as a visible indication that the watch is running.Quartz Convenience
Battery-powered operation offers accurate, low-maintenance timekeeping. Water resistance, crown construction, bezel design, crystal and testing should be checked on the individual watch listing.Useful for Grab-and-Go Watches
A VH31 watch can suit buyers who want to pick up a watch after several days and have it running without winding or resetting the time, subject to normal quartz accuracy and battery condition.Works Across More Than Dive Watches
The same movement can work in field, military, vintage-inspired and everyday designs. Choose the complete watch by size, water resistance, dial layout and intended use—not by movement name alone.
Advantages of the VH31 Over Other Movements
How the VH31 compares depends on what you value:
Versus Conventional Quartz: the main visual difference is the four-step-per-second centre seconds hand, while retaining battery-powered operation.
Versus Mechanical Movements: quartz generally offers greater timekeeping accuracy and less routine movement maintenance, while mechanical watches appeal for their mechanical construction and winding experience.
Versus Other Sweep-Second Quartz Options: compare the complete watch rather than choosing on sweep rate alone. Case size, crystal, water resistance, dial layout, bracelet or strap, and current price can matter more in daily use.
VH31 vs VH60 and VH65: What Changes?
The main difference is the display, not a faster sweep. In TMI's VH lineup, VH31 is a three-hand time-only movement, VH60 adds a 24-hour subdial, and VH65 adds a date subdial.
| Movement | Display beyond hours, minutes and seconds | Listed battery |
|---|---|---|
| VH31 | None; time only | SR920SW; approximately 2 years |
| VH60 | 24-hour subdial | SR920SW; approximately 2 years |
| VH65 | Date subdial | SR920SW; approximately 2 years |
TMI describes the VH series' seconds-hand motion as quarter-second steps: four advances per second, rather than a continuous glide. Choose by the dial information you want. These shared specifications do not establish drop-in compatibility between movements or guarantee battery life in a finished watch.
Featured VH31-Powered Watches
The VH31 movement works particularly well across different watch styles, from compact dive watches to military-inspired field watches and everyday designs. The examples below show how versatile a sweep-second quartz movement can be. Availability can change by configuration, so check each linked listing before ordering.
1. Watchdives WD7922
The WD7922 is a compact 37mm vintage-inspired dive watch with a 45.5mm lug-to-lug and slim 11.4mm profile. Its VH31 movement provides smooth four-step-per-second seconds-hand motion, while sapphire crystal, 200m water resistance and a 316L stainless steel case make it a practical everyday diver.
2. Watchdives WD1969 Pro
The WD1969 Pro combines a compact 38mm case with a clean no-date dial, strong BGW9 lume and distinctive dimensional detailing. Powered by the VH31 sweep-second quartz movement, it offers smooth seconds-hand motion together with sapphire crystal, a screw-down crown and 200m water resistance.
3. Watchdives WD1972
The WD1972 takes a more military-inspired approach, with a sandblasted stainless steel case, highly legible dial and compact 46mm lug-to-lug measurement. Its VH31 movement, sapphire crystal, screw-down crown and 200m water resistance make it an example of field-watch character combined with quartz convenience.
Availability note: this model has previously been out of stock. Treat it as a VH31 design example and check the linked listing for current availability before ordering.
4. Watchdives WD1980
The WD1980 is a slim 39mm military field watch designed for comfortable everyday wear. At only 9.6mm thick, the VH31-powered no-date version combines a smooth sweep-second display with BGW9 lume, sapphire crystal and a compact 45.5mm lug-to-lug.
Movement choice matters: current no-date configurations use the VH31. Day-date configurations use a Ronda 517 movement, so choose a no-date option if you specifically want VH31 sweep-second quartz.
5. Watchdives WD1965
The WD1965 brings vintage dive-watch proportions into a compact modern package. Its approximately 37mm case, 45.5mm lug-to-lug and 11.1mm thickness make it especially wearable, while the VH31 movement, domed sapphire crystal and 200m water resistance add modern everyday practicality.
6. Watchdives WD1016
The WD1016 is a compact 37mm Explorer-inspired everyday watch with a 45.5mm lug-to-lug and slim 10.9mm profile. Its VH31 movement provides quartz accuracy and smooth seconds-hand motion, while sapphire crystal, a screw-down crown and 100m water resistance make it a versatile option for daily wear.
Which VH31 Watch Should You Choose? Four Current Buying Scenarios
The best VH31 watch depends on how you plan to wear it. The following choices were checked against current Watchdives listings on September 16, 2026; stock can change after publication.
| Use case | Current model | Why it fits | Key point before buying |
|---|---|---|---|
| Compact vintage-style dive watch | Watchdives WD7922 | 37mm case, sapphire crystal and 200m water resistance | Choose the dial, bezel and lume configuration you prefer |
| Modern 38mm tool-style diver | Watchdives WD1969 Pro | 38mm case, sapphire crystal, 200m water resistance and strong BGW9 lume | Availability varies by dial, indices and clasp combination |
| Slim military / field-style everyday watch | Watchdives WD1980 V3 | 39mm case and 9.6mm thickness make it easy to wear | Select a no-date configuration for VH31; day-date uses Ronda 517 |
| Vintage 50-fathoms-inspired everyday diver | Watchdives WD50Q V2 | 38mm case, VH31 movement, sapphire crystal, 200m water resistance and strap/bracelet choices | Bezel and band details vary by selected configuration |
If none of these matches your preferred size or style, browse the VH31 Watches collection and compare the current listings rather than choosing by movement name alone.
How to Choose a VH31 Watch
Start with the use case: a rotating-bezel dive-style watch, a compact field watch and an everyday Explorer-style watch can all use the same VH31 movement but wear very differently.
Check case size and thickness: dimensions often matter more on the wrist than the movement itself.
Check the complete water-resistance specification: movement choice does not establish diving capability. Review the crown, case, crystal, bezel and stated water resistance of the individual model.
Check the exact variant: some product pages combine different movements or hardware under one listing. WD1980 is a clear example: no-date versions use VH31 while day-date versions use Ronda 517.
Confirm current availability: stock and configurations can change, so use the linked product page as the current source of truth before ordering.
VH31 Battery, Accuracy and Ownership Questions
What battery does a VH31 use, and how long does it last?
TMI specifies SR920SW and estimates roughly two years of battery life. That is not a promise of two years from the purchase date: battery condition and time already spent running matter. Use the exact watch's service instructions for replacement.
Does a VH31 need winding or have a date?
No winding is needed: this is a battery-powered three-hand movement, not an automatic. VH31 is a time-only choice. When one product listing includes calendar or other movement options, confirm the selected variant rather than assuming the entire page is VH31-powered.
Does every VH31 have two jewels?
No. The VH31B sheet linked above lists zero jewels. Do not apply a jewel count from another revision to every watch labeled VH31, and do not infer the installed revision without model-specific evidence.
Does four ticks per second mean four times better accuracy?
No. The visible sweep describes how often the hand advances, not how accurately the watch keeps time. The monthly accuracy specification and the seconds-hand step rate measure different things.
How do you set the time?
TMI's VH31 operating instructions describe pulling the crown to the time-setting click, setting the hour and minute hands, then returning the crown to its normal position at the time signal. Follow the complete watch's instructions for any screw-down crown; crown construction is not determined by the movement name.
Does VH31 make a watch suitable for diving?
No. A movement specification is not a water-resistance rating for a complete watch. Compare the individual case, crown, bezel and stated intended use; field, dress and dive-style watches can share the same movement.
Conclusion
The VH31 is an appealing option for buyers who want quartz accuracy and low-maintenance ownership with a smoother-looking seconds hand. Its four-step-per-second centre seconds hand gives it a more fluid appearance than conventional one-step-per-second quartz movements while retaining battery-powered convenience.
The movement works across dive-style, field, military and everyday watches. For a purchase decision, compare the complete watch—especially size, water resistance, crystal, bezel, strap or bracelet and exact variant—rather than choosing on the movement alone.
Ready to compare models? Browse our VH31 Watches collection to see current sweep-second quartz watches and their live configurations.
