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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteThe Swatch Sistem51 Petite Seconde gives the automatic-watch range a more dress-oriented look through a small-seconds display, date window, sun-brushed dial, applied markers and leather strap. The black version is reference SY23S400; Swatch’s UK product page listed it at £222 on 7 October 2026, though price and availability can change.
What is the Swatch Sistem51 Petite Seconde?
It is a styling and display variation within Swatch’s Sistem51 collection, not a documented new movement. Swatch describes PETITE SECONDE BLACK (SY23S400) as an automatic mechanical watch with a small-seconds subdial at 6 o’clock, a date window, a sun-brushed black dial, applied markers and a black leather strap. These details give the face a more conventional dress-watch vocabulary than a simple central-hours-and-minutes layout.
The word “Petite Seconde” refers to the small-seconds register: seconds are shown on a separate subdial rather than by a long central seconds hand. Swatch’s official product description is available on its UK PETITE SECONDE BLACK page.
What does the small-seconds dial do?
The subdial at six o’clock displays elapsed seconds on its own smaller scale. It changes the visual balance of the dial and distinguishes seconds from the central hour and minute hands. The date window adds a separate calendar display; the available product information does not specify a different technical function or performance benefit for this layout.
#1 Best Overall
- Collection: SISTEM 51 2
- Watch Size: 51 mm round case with push/pull crown
- Water Resistance: 100 feet
- Manufacturer Warranty: 2 year international warranty
- Free battery exchange for your watch at swatch retail locations
What is the Sistem51 movement background?
Swatch Group’s announcement dated 25 April 2013 describes Sistem51 as a self-winding mechanical movement made from 51 components, assembled through a fully automated process, and offering a 90-hour power reserve. The company also described one central screw, factory laser adjustment, ARCAP components and a transparent rotor. Those are manufacturer statements about the Sistem51 platform, not independent test results or evidence of a movement revision specific to Petite Seconde. Swatch Group’s historical description is in its Sistem51 announcement.
Black and blue Petite Seconde models
| Model | Reference | Dial and strap | Displayed availability and price |
|---|---|---|---|
| PETITE SECONDE BLACK | SY23S400 | Sun-brushed black dial; black leather strap | Swatch’s UK regional page listed £222 and presented a purchase option on 7 October 2026. Price and stock may change. |
| PETITE SECONDE BLUE | SY23S403 | Light-blue dial; blue leather strap | Swatch’s international page showed “permanently sold out everywhere” when checked on 7 October 2026 and advises checking regional availability. See the PETITE SECONDE BLUE page. |
The colorways are the supported basis for comparison here. The available information does not establish differences in movement or measured performance between them.
Rank #2
- Collection: IRONY SISTEM51
- Watch Size: 42mm round plastic case with push/pull crown
- Water Resistance: Up to 100 feet
- 2 Year International Warranty
- Automatic and amagnetic movement powered by your moves - 90 hour power reserve.
How much is the Swatch Petite Seconde?
Swatch’s UK regional product page listed the black SY23S400 at £222 on 7 October 2026. This is a dated UK listing, not a guaranteed current price, a global price or a stable recommended retail price. Check the product page for the relevant region before buying.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the available evidence does not establish
The product information and Swatch Group’s movement history establish the design details and the manufacturer’s description of the wider Sistem51 platform. They do not establish the Petite Seconde’s specific launch date or provide independent findings on accuracy, comfort, durability or value. A more elegant dial layout is observable; a technical upgrade for this particular model is not documented in these sources.
Quick Recap
Best Value
- Swatch Holiday Collection
- Watch Size: 42mm round case with push/pull crown
- Water Resistance: 100 Feet
- 2 Year International Warranty
Rank #4
- Collection: SISTEM51 PETITE SECONDE
- Watch Size: 42mm round plastic case with push/pull crown
- Water Resistance: Up to 100 feet
- 2 Year International Warranty
- Automatic and amagnetic movement powered by your moves - 90 hour power reserve.
Rank #3
- ESSENTIALS COLLECTION
- Watch Size: 42mm round case with push/pull crown
- Water Resistance: 100 Feet
- 2 Year International Warranty
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.
