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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Christopher Ward has returned its JJ01 mechanical jump-hour module to the C1 collection in the 39mm C1 Jump Hour Mk V. Instead of showing the hour with a conventional hand, the watch displays it as a numeral through an aperture; the numeral advances when the minute hand passes twelve. The maker’s handbook specifies a Sellita SW200-1 movement with the JJ01 module, a 38–41-hour power reserve and 30m water resistance.
What is a jump-hour watch?
A jump-hour watch shows the hour as a numeral in a window rather than pointing to it with an hour hand. On the C1 Jump Hour Mk V, the hour disc changes in a discrete jump as the minute hand passes twelve. The minute hand remains an ordinary analogue display, so the time is read by combining its position with the numeral in the aperture.
This arrangement gives the dial a different character from a conventional three-hand watch: the hour is presented digitally, while the minutes are read around the dial. The Mk V’s display is built into a layered dial rather than printed as a standard hour-hand layout.
How does the JJ01 jump hour work?
The JJ01 is a mechanical module paired with a Sellita SW200-1, according to Christopher Ward’s owner’s handbook. When the minute hand completes its circuit and passes twelve, the module advances the hour disc by one numeral.
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- 1.316L Stainless Steel Case/Screw Crown/Steel Closed Caseback
- 2. Seagull ST1721 Jump Hour Mechanical Movement
- 3. Sapphire Crystal / Diameter: 34.5MM / Case Thickness : 10.4MM / Lug to Lug =45MM
- 4.Comfortable Rubber Strap /5.Butterfly Clasp
- 5.Band Width: 20MM*18
For setting, the handbook instructs owners to pull the crown to position two and turn it to move the minute hand. It recommends moving past the desired minute and then setting backwards for precision. When the watch is set backwards, a safety feature may delay the first hour jump; the disc should advance normally at the next pass of the minute hand through twelve. Push the crown flush against the case afterward to maintain water resistance.
What are the C1 Jump Hour Mk V’s specifications?
These are the manufacturer’s specifications, not independent test results. The handbook describes an applied sapphire dial with a stamped azuré base pattern, a multi-faceted ring and a stepped sapphire hand. Super-LumiNova C1 BL Grade X1 and a lower Globolight block on the hour disc are also listed.
Rank #2
- 1.316L Stainless Steel Case/Screw Crown/Steel Closed Caseback
- 2. Seagull ST1721 Jump Hour Mechanical Movement
- 3. Sapphire Crystal / Diameter: 34.5MM / Case Thickness : 10.4MM / Lug to Lug =45MM
- 4.Comfortable Rubber Strap /5.Butterfly Clasp
- 5.Band Width: 20MM*18
| Specification | Christopher Ward listing |
|---|---|
| Movement | Sellita SW200-1 with JJ01 module |
| Case material | 316L stainless steel |
| Case diameter | 39mm |
| Case height | 14mm |
| Lug-to-lug | 47.30mm |
| Weight | 66g |
| Water resistance | 3 ATM (30m) |
| Frequency | 28,800 vibrations per hour (4Hz) |
| Power reserve | 38–41 hours |
| Timing tolerance | -20/+20 seconds per day |
| Jewels | 26 |
| Strap width | 20mm |
How big is the C1 Jump Hour Mk V?
The case measures 39mm across, 14mm high and 47.30mm from lug to lug. Diameter is only one part of fit: the lug-to-lug measurement describes the case’s span across the wrist, while the 14mm height gives an indication of how much it stands above it. Check those dimensions against a watch you already find comfortable, especially if wrist coverage or height under a cuff is a concern.
Is the C1 Jump Hour Mk V water resistant?
Christopher Ward rates it at 3 ATM (30m). That is the stated rating, not a guarantee that it is suitable for swimming or other water activities. The handbook also says the crown should sit flush against the case to maintain water resistance.
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- Premium Stainless Steel Construction: 316L stainless steel case with screw crown and steel closed caseback for durability and longevity
- Seagull ST1721 Jump Hour Mechanical Movement: Features reliable automatic mechanical movement with unique jumping hour complication
- Comfortable Genuine Leather Strap: Equipped with genuine leather strap and pin buckle for secure and comfortable wear
- Sapphire Crystal Protection: AR coated sapphire crystal provides scratch resistance and clarity with diameter of 39mm, case thickness of 10.4mm, and lug to lug measurement of 46.8mm
- Standard Band Width: 20mm to 18mm band width allows for easy strap replacement and customization options
What versions and strap options are available?
Launch coverage described two dial colours: Noon blue and Dawn champagne. Each was reported with a leather strap or a five-link Consort steel bracelet. The handbook lists a 20mm strap width and quick-release pins, so a replacement 20mm watch strap may fit, but confirm attachment compatibility before buying.
Fratello’s November 12, 2025 launch article reports the following launch prices. Time+Tide also reported the UK prices on November 8, 2025. These are publication-date figures, not a verified current quote.
Rank #4
- 【Vintage-Inspired Jumping Hour Mechanism】 A classic jump hour watch with vintage character, powered by the Seagull ST1721 mechanical movement. Unlike traditional hands, this watches displays the hour in a window, jumping precisely at each hour change. Important – Time Setting: Always advance the minute hand clockwise only. Do not turn the minute hand counterclockwise, as this may damage the movement.
- 【Classic 39mm Size for Daily Wear】 39mm case, 20mm genuine leather strap. Total watch length is 260mm, fitting wrists from 160mm to 200mm comfortably. Real wrist test (180mm): The buckle sits at the middle hole, with 3 spare holes on each side – easy to adjust for a looser or tighter fit.
- 【Jumping Hour Characteristic (Normal Behavior)】 Due to the gear function of the Seagull movement, the hour may sometimes jump at 57 minutes instead of exactly 60 minutes. This is normal and does not affect accuracy or functionality.
- 【Premium Materials – Sapphire Crystal & 316L Steel】 Scratch-resistant AR-coated sapphire crystal, 316L stainless steel case, and screw-down crown. Built for daily wear with 50M water resistance (rain, sweat, splashes – not for swimming).
- 【Great Gift for Watch Enthusiasts】 Available in multiple colors. Comes in an box – perfect for birthdays, anniversaries, Father's Day, or as a unique gift for a watch lover.
| Configuration | Launch price reported by Fratello, November 12, 2025 |
|---|---|
| Leather | €2,800 / £2,150 / US$2,975 |
| Consort bracelet | €2,975 / £2,285 / US$3,165 |
Thomas Van Straaten’s Fratello account describes handling the blue Noon version on a steel bracelet; that is one reviewer’s experience, not a claim about how every configuration wears. Fratello also reported a five-year movement warranty. Check current availability, pricing and warranty terms with Christopher Ward for the market and configuration you are considering.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What stands out about the Mk V?
The watch’s defining choice is its display: a jumping numeral replaces the conventional hour hand, while the minute hand remains analogue. Its 39mm diameter is paired with a 47.30mm lug-to-lug span and 14mm height, so the full case dimensions—not diameter alone—matter when judging fit. The leather and bracelet versions offer different wearing preferences, while the maker’s 30m rating is a modest water-resistance specification rather than an invitation to assume swimming use.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
