The Par Weber Coefficient’s defining feature is an always-on illuminated dial: StrapHabit’s 2020 review describes a system of 12 LEDs intended to make the time readable in darkness without pressing a button. Reviewer Nick Lehner found that approach useful, but the review is a sample-level assessment from September 2020—not current proof of the watch’s price, availability, or support.
What is the Par Weber Coefficient?
The Coefficient is a quartz wristwatch built around Par Weber’s Enduro-Lume illumination system. In its September 14, 2020 hands-on review, StrapHabit describes the system as using 12 LEDs to keep the dial illuminated continuously. That is the product’s central distinction: the wearer does not have to activate a conventional backlight when entering a dark space.
The reviewer also recounts a development period of “six months and 257 prototypes.” That history is reported by the review and is not independently corroborated. Read StrapHabit’s review.
What the 2020 review reports about the watch
These are specifications as reported in the 2020 review, not a current manufacturer specification sheet.
#1 Best Overall
- MANUAL WINDING: Designed for precision, this hand-wound watch is powered by the exclusive H-50 movement, offering an extended 80-hour power reserve for reliable performance.
- WATER RESISTANT TO 50M: Withstands 5 bar (50 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- BUILT FOR ADVENTURE: Featuring a 38mm stainless steel case, a black dial and textile strap, this watch combines durability and functionality. With Super-LumiNova and sapphire crystal, it’s ready to tackle your outdoor challenges.
- PREMIUM MATERIALS: Textile strap with pin buckle offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
| Detail | What StrapHabit reported |
|---|---|
| Movement | Ronda 715 quartz movement |
| Illumination | Enduro-Lume system described as using 12 LEDs |
| Power | Separate batteries for the movement and illumination module; the illumination battery was intended to last about as long as the movement battery |
| Case | 316L stainless steel with black PVD coating |
| Water resistance | 100 m |
| Lug width | 20 mm |
| Package | Leather and nylon straps, plus a spring-bar tool |
| Price cited | $599 in the 2020 review; historical price, not a current quote |
The battery-life statement describes the design intention reported by the reviewer, not a measured runtime or a guarantee. The review does not establish current battery specifications or official replacement instructions.
How does the always-lit dial work in practice?
Lehner’s review found the illuminated display useful for reading the time in darkness and changing light. That is one reviewer’s experience with a sample, not a controlled comparison or a guarantee that every wearer will find the light comfortable. A continuously lit dial also means the illumination is present when it may not be needed; whether that is convenient or distracting depends on the wearer and setting.
Rank #2
- MANUAL WINDING: Designed for precision, this hand-wound watch is powered by the exclusive H-23 movement, offering an extended power reserve for reliable performance.
- WATER RESISTANT TO 100M: Withstands 10 bar (100 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- BUILT FOR ADVENTURE: Featuring a 40mm stainless steel case, a white dial and stainless steel bracelet, this watch combines durability and functionality. With Super-LumiNova and sapphire crystal, it’s ready to tackle your outdoor challenges.
- PREMIUM MATERIALS: Stainless steel bracelet with folding clasp offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
The review contrasts the concept informally with button-activated backlights, tritium, and conventional luminous material. A button backlight is available when activated rather than continuously; luminous material and tritium are different approaches to visibility in darkness. The source does not provide a controlled test of brightness, legibility, comfort, or longevity across these technologies, so it cannot establish that the Coefficient outperforms them generally.
Straps and everyday wear
StrapHabit reports a 20 mm lug width and says the watch package included leather and nylon straps as well as a spring-bar tool. The reviewer notes that aftermarket straps could be fitted at that width. Treat that as a fit starting point rather than confirmation that every strap will suit the case or its spring bars.
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- MANUAL WINDING: Designed for precision, this hand-wound watch is powered by the exclusive H-23 movement, offering an extended power reserve for reliable performance.
- WATER RESISTANT TO 100M: Withstands 10 bar (100 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- BUILT FOR ADVENTURE: Featuring a 40mm stainless steel case, a white dial and green textile strap, this watch combines durability and functionality. With Super-LumiNova and sapphire crystal, it’s ready to tackle your outdoor challenges.
- PREMIUM MATERIALS: Textile strap with pin buckle offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
Comments on the review page ask about a green strap shown in photographs, but those questions do not establish who made it or whether it was sold with the watch. The review-era package details likewise do not confirm what, if anything, a buyer would receive today.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Price, availability, and what cannot be confirmed
The $599 figure belongs to StrapHabit’s 2020 review. No current official product page or sales listing was established, so current stock, price, authorized sellers, warranty, service access, and product support remain unconfirmed. Reader comments asking why the watch was unavailable do not answer whether Par Weber is currently selling it.
Rank #4
- AUTOMATIC MOVEMENT: Swiss H-10 movement with 80-hour reserve ensures consistent performance. Experience precision that matches both daily tasks and adventures, a testament to Swiss craftsmanship in automatic timekeeping.
- WATER RESISTANT TO 100M: Withstands 10 bar (100 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- BUILT FOR ADVENTURE: Featuring a 42mm stainless steel case, a black dial and leather strap, this watch combines durability and functionality. With Super-LumiNova and sapphire crystal, it’s ready to tackle your outdoor challenges.
- PREMIUM MATERIALS: Leather strap with pin buckle offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
WatchCharts republishes the StrapHabit review; it is not an independent second hands-on test. See the WatchCharts republication.
Who might appreciate the Coefficient?
The idea is most relevant to someone who wants the time visible in darkness without operating a light button and is comfortable with a continuously illuminated dial. The review supports that use case as one reviewer’s positive impression, but it does not answer whether the watch can currently be bought or serviced. Before pursuing a purchase, seek current confirmation of availability, price, warranty, battery replacement, and support directly from a verifiable seller or manufacturer channel.
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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.
