Is the Steinhart Nav B-Chrono 42 the Ultimate Modern Pilot Watch?

Aviation-inspired timepieces have a distinctive place in horology, combining functional design, precision, and historical influence. Originally developed as navigation tools for aviators working in demanding cockpit environments, pilot watches emphasize readability, reliability, and durability. Over the decades, these functional instruments have evolved from specialized military equipment into versatile accessories for watch enthusiasts.

Steinhart Nav B 42 watches have become known for combining Swiss-made watchmaking with traditional aviation-inspired aesthetics. Their Flieger designs feature clean layouts, robust cases, and mechanical movements that draw inspiration from classic military watches. As preferences have evolved, these designs have also been adapted into more compact dimensions for everyday wear.

Gnomon Watches presents the Steinhart Nav B-Chrono 42 Classic A-Type Black, a timepiece that adapts the classic flight-watch format for modern wearers. The model combines traditional cockpit-inspired details with more compact proportions, resulting in a mechanical chronograph designed for everyday use. This Steinhart watch review takes a closer look at how the model combines familiar aviation design elements with a more contemporary size.

Steinhart Nav B 42: A Smaller Fit

In previous years, traditional pilot chronographs from Steinhart were primarily available in standard 44mm and massive 47mm case sizes. While these larger proportions were in keeping with the dimensions associated with historical military watches, the 47mm version could feel too large for some modern wearers. Its substantial wrist presence could also make it less convenient for everyday activities, office wear, or wearing under fitted cuffs.

Steinhart later introduced the Nav B 42 series with a more compact 42mm case. The smaller dimensions give the watch a more balanced presence on the wrist and make it easier to wear for everyday activities. The proportions also retain the bold character associated with the Nav B design while making the watch suitable for a wider range of wrist sizes.

Despite the smaller case, the watch retains two notable design elements associated with the original models. It features a large onion- or diamond-style crown, a design commonly associated with pilot watches and practical operation. It also retains a double-riveted leather strap, which adds to the watch's aviation-inspired appearance.

The Nav B-Chrono 42 represents the chronograph version of this more compact design. By combining a mechanical chronograph movement with a 42mm case, the model brings together the presence of a traditional pilot watch with proportions suited to everyday wear.

Steinhart Nav B Chrono 42 Review

Examining the Nav B-Chrono 42 Classic A-Type Black reveals a combination of modern German watch design and a Swiss mechanical movement. Details such as the gradient dial and case finishing contribute to its functional and aviation-inspired character. The following sections take a closer look at the key components of this Steinhart Nav B Chrono 42.

Driving Force: The ETA Valjoux 7750 Elaboré Premium Engine

At the core of the Nav B-Chrono 42 is the Swiss-made ETA Valjoux 7750 Elaboré Premium automatic chronograph movement. It operates at a frequency of 28,800 vibrations per hour (4Hz), uses 25 jewels, and provides a power reserve of approximately 48 hours. The Valjoux 7750 is widely recognized for its established construction and use in mechanical chronograph watches.

Steinhart presents the movement through a sapphire exhibition case back. The visible finishing includes blued screws, circular perlage, and Geneva stripes. A custom golden skeletonized rotor is also visible through the case back, adding a decorative element to the movement.

Tailored Proportions: The 316L Stainless Steel Case Construction

The Nav B-Chrono 42 uses a 316L stainless steel case measuring 42mm in diameter, with a lug-to-lug distance of 49.8mm. The case has a thickness of 16mm, accommodating the automatic chronograph movement while giving the watch a substantial presence on the wrist.

Satin-brushed finishing covers the top of the lugs and the case sides, while the polished bezel provides a contrast around the crystal. The 20mm lug width also allows the watch to be paired with different strap options.

Cockpit Clarity: Smokey Gradient Dial and High-Contrast Layout

The dial prioritizes legibility and takes inspiration from classic Type A pilot instruments. A subtle smokey black gradient transitions from a lighter charcoal shade in the center to a darker outer edge. The darker perimeter helps provide contrast around the minute track and other dial elements.

Steinhart omits the traditional day-date windows at 3 o'clock, resulting in a cleaner chronograph layout. The two main chronograph sub-dials are positioned at 12 and 6 o'clock for measuring elapsed minutes and hours, while a small seconds sub-dial sits at 9 o'clock. Together, these elements create a balanced tri-compax layout.

Illumination and Optics: Super-LumiNova BGW9 and Sapphire Glass

Visibility in low-light conditions is an important feature of flight-inspired timepieces. The Arabic numerals, hour markers, and sword-style hands are filled with Swiss Super-LumiNova BGW9 lume. In daylight, the luminous material appears white against the dark dial.

In low-light conditions, the BGW9 lume produces a blue glow. The dial is protected by a domed sapphire crystal designed to resist everyday scratches. The inner side of the crystal also features double anti-reflective coatings to help reduce glare and improve visibility under direct lighting.

Heritage Touches: Double-Riveted Strap and Tactical Hardware

The aviation-inspired design is complemented by a black leather strap with double steel rivets near the lugs. Made from lamb leather, the strap tapers from 20mm at the lugs to 18mm at the buckle, providing a gradual fit around the wrist. The riveted design adds another visual reference to traditional flight-watch styling.

The leather strap is secured with a stainless steel pin buckle featuring an etched Steinhart logo. Its brushed finish matches the treatment of the case. The traditional lug design also allows the watch to be paired with different aftermarket straps, including NATO and vintage-style leather options.

Built for Daily Use: Functional Water Resistance and Ergonomics

Although pilot watches are primarily associated with aviation, water resistance is also relevant for everyday wear. The Nav B-Chrono 42 provides 50 meters (5 ATM) of water resistance, offering protection against everyday exposure to rain and splashes.

The chronograph pushers are positioned on either side of the crown and provide access to the watch's timing functions. The onion-style screw-down crown has a textured surface for grip and allows manual winding and time adjustment.

Styling Versatility: Pairing the Nav B-Chrono 42 for Everyday Wear

The 42mm case gives the Nav B-Chrono 42 a versatile presence across different styles. While larger pilot watches can have a more pronounced wrist presence, the 42mm format offers a more compact alternative for everyday wear. Its black dial and contrasting silver details also work well with a range of casual and smart-casual outfits.

With its factory double-riveted lambskin leather strap, the watch maintains a vintage-inspired military character. The combination can work well with casual pieces such as canvas jackets, denim shirts, leather outerwear, and boots. The riveted strap adds a distinct aviation-inspired detail to the overall look.

For a more understated appearance, the original strap can be replaced with a smooth dark brown or black leather strap. The polished bezel adds a subtle touch of contrast, while the clean, date-free dial maintains a refined appearance under a shirt cuff.

NATO, ZULU, and canvas straps can also give the watch a more casual tool-watch character. Different strap materials and colors allow the overall appearance to be adjusted to suit different outfits. With its 20mm lug width, the watch can accommodate a range of strap options.

Final Thought

Steinhart watches review for the Nav B-Chrono 42 Classic A-Type Black combines elements of traditional aviation watch design with proportions suited to modern wear. Its 42mm case retains familiar details such as the riveted strap and onion-style crown, while the absence of a date window contributes to its clean, instrument-inspired appearance.

Inside, the ETA Valjoux 7750 movement provides the mechanical foundation for the chronograph. Other details, including the smokey gradient dial and BGW9 Super-LumiNova, complement the watch's focus on legibility and functionality. Overall, the model brings together aviation-inspired design, a Swiss-made mechanical movement, and a case size intended for everyday wear.


Maker
Movement
Case
Lug Width
Water resistance
Dimensions