PAR WEBER Coefficient is a modern sports watch that features a patent-pending and world premier illumination system, Enduro-Lume™.
Enduro-Lume™ is the brainchild of Jon Weber, founder of PAR WEBER. This American watch company has been based in Chicago, Illinois.
Enduro Lume™ has significant advantages over the most common forms of wristwatch illumination: conventional glow-in-the-dark LumiNova® derivatives, trigalight® (tubes filled with radioactive tritium), and electroluminescent panels (e.g., Indiglo®).
In 2018, not impressed with the night time visibility of the Super-LumiNova watches in his collection (they were rarely legible when he needed them most: in the middle of the night), Jon Weber decided to design an electroluminescent system that could continuously illuminate a wristwatch at all times.
Over the next six months, he made 257 prototypes. Each prototype progressively refined the system’s electronics, form factor, and performance profile. In the same time, he searched out and secured manufacturing partners across the United States, and incorporated input to improve manufacturability at scale. Finally, he traveled to Switzerland to search out the right watchmakers to build the timepiece itself.
Enduro-Lume™ is a patent pending innovation that provides continuously operating electroluminescent illumination system. Twelve purpose-built light emitting diodes are concealed beneath the bezel.
While other LED-based illumination systems can only run for a matter of seconds at a time in order to preserve battery power, specialized circuitry and precision materials engineering enable the Enduro-Lume™ system to clearly illuminate the entirety of the dial at all times, while achieving incredibly long battery life (up to 3+ years).
The Coefficient Watch
The Coefficient watch was designed with three major performance objectives: legibility, toughness, and reliability. It’s made for those who depend on their wristwatch day in and day out.
The Coefficient achieves these objectives thanks to its high-contrast dial and always-on illumination system, the time-tested materials in its construction (PVD coated steel and a sapphire glass crystal), and a practical and extremely accurate Swiss-made quartz movement.
The watch is driven by a Swiss-made Ronda 715 quartz movement. The quartz movement makes a logical pairing to the Enduro-Lume™ illumination system, which derives power from its own coin cell battery. Because the battery change intervals are calibrated to be synchronized between the quartz movement and the Enduro-Lume™ system, the watch does not need to be opened more frequently than any other quartz-powered timepiece.
In addition to hour, minute, and seconds function, the Coefficient watch also features a traditional 3 o’clock date window. Its features a bi-directional, 120 click rotating bezel with red ‘0’ marker for easily identifying the orientation of the bezel.
The Coefficient watch features an ergonomic case design. While designing the watch, the brand put particular emphasis on the three elements that directly impact the daily experience of wearing the Coefficient: the bezel, the crown, and the lugs. With its a tall, tooth-edge grip, the Coefficient’s “aperture ring” bezel, provides easy operation, regardless of whether you are barehanded or wearing gloves.
The Coefficient’s crown is similarly designed for easy operation. Because it is mounted high on the case, it is more comfortable to wear and is easier to operate without removing the watch from your wrist. The crown guards are offset to the lower half of the crown itself, which provides protection while preserving easy access.
The Coefficient’s lugs are mounted low on the case and conform to the shape of the wrist. This enables the watch to comfortably accommodate a huge range of wrist sizes. The lugs’ 20mm width is a standard size which gives ample choice to swap out third party straps, and their drilled-through lug holes make removal of spring bars a simple matter.
In addition to the conventional markings you typically find (such as the Coefficient’s Swiss movement origin and 100M water resistance rating), this timepiece also features inscriptions of some useful reference information on the case back. The kinds of things that are handy to know in case you forget them or would like to know them without opening the watch: the movement model (Ronda 715), which batteries are required for the movement and Enduro-Lume™ system (371 and CR2025, respectively), and the lug width for purchasing replacement straps.
PAR WEBER designed the timepiece in Chicago and manufactures the Enduro-Lume™ systems in the United States (80% U.S. content). The Enduro-Lume™ systems are then built into the watches themselves by partners in Switzerland according to Swiss standards.
PVD-coated 316L stainless steel case
48mm lug-to-lug length
20mm-wide drilled lugs
Zero-distortion flat sapphire glass crystal
120-click bidirectional “aperture ring” bezel
100M/330ft water resistance rating with heavy duty gasketed push-pull crown
Enduro-Lume™ always-on illumination system (patent pending)
Swiss-made Ronda 715 quartz movement
Assembled in Switzerland with a Swiss-made movement and U.S.-made illumination system