The Christopher Ward C9 Harrison Jumping Hour replaces the usual hour hand with a numeral in a window. Its minute hand moves continuously around the dial; when it completes an hour, the numeral advances in a distinct jump. The exact dimensions and strap width depend on the version, so check the watch’s reference before buying a strap or comparing listings.
How does the C9 Jumping Hour display work?
The watch pairs a conventional moving minute hand with a numeric hour display. Christopher Ward’s Mk II manual describes the minute hand as providing the impetus for the hour numeral’s jump, combining an analogue hand with a digital-style hour indication. The numeral changes at the hour rather than moving gradually around the dial. Christopher Ward Mk II manual
Why the jump matters mechanically
Advancing the hour numeral requires energy. The Mk II manual describes a cam, lever and star mechanism behind the change. Worn & Wound notes that this extra demand can place stress on the movement and affect accuracy, presenting it as a design consideration described in the accompanying manual—not as a measured result for a particular C9 example. Worn & Wound review
What does “Harrison” refer to?
Christopher Ward’s original C9 Jumping Hour manual says the calibre was designed and developed with master watchmaker Johannes Jahnke and drew inspiration from John Harrison. That explains the name and design reference; the modern C9 is not one of Harrison’s historical instruments. Christopher Ward C9 Jumping Hour manual
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
#1 Best Overall
- 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
What size is the C9 Jumping Hour, and what strap does it take?
There is no single size or strap width to apply to every C9 Jumping Hour. A Ward Hoard listing for a specific Mk III 43 mm example gives a 43 mm case, 22 mm lug width, 13.3 mm height and CW JJ01 automatic movement, identified as an SW-200 modification. Those are details for that listed watch, not universal family specifications. Ward Hoard Mk III 43 mm listing
WatchPro reports that the Mk III line also added a 40 mm option, so the 43 mm listing should not be assumed to describe every Mk III. The cited sources do not establish lug width for that 40 mm option. WatchPro report on the 40 mm option
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
Before ordering a replacement strap, confirm the exact reference and measure or verify the lug width for that watch. A listing for the standard C9 Harrison Automatic is not a substitute: that separate model is listed at 43 mm with 20 mm lugs, 10 mm height, 50 m water resistance and an ETA 2824-2 movement. Those specifications do not describe the Jumping Hour. Ward Hoard C9 Harrison Automatic listing
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare C9 Jumping Hour listings
Compare the exact generation and reference rather than relying on the broad C9 name. A listing’s measurements describe that particular watch, and seller details may vary.
Rank #3
- 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
- Check the generation and reference, then confirm case diameter and lug width.
- Note the movement or module stated for that specific version; the cited Mk III 43 mm listing identifies CW JJ01 (SW-200 Mod).
- Compare condition, included papers and accessories, service history and seller warranty.
- For a strap purchase, match the lug width to the exact watch rather than borrowing a measurement from the standard C9 Harrison Automatic.
Current production status, stock, prices and Amazon availability are not established by the cited manuals and listings. Verify a dated seller listing and its exact reference before making a purchase decision.
Quick Recap
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.
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.
