After six years in development, Barrelhand is formally launching the Monolith, a watch that represents a new generation of the tool watch genre built explicitly for the space age. Watches have played an important role in the history of human space travel, but few have actually been designed and engineered to meet ISO aerospace standards, NASA material guidance, and EVA/IVA testing protocols consistent with the needs of a crewed deep-space mission. The Monolith represents exactly that, with Barrelhand going to great lengths to meet a standard that tool watches are rarely held to these days.
At the dawn of the Apollo program, with five years of learning from the Gemini program under their belt, NASA issued a memorandum outlining the need for a standard flight-crew wrist watch. The story that follows is a widely known part of watch lore, with Omega’s Speedmaster ultimately earning the coveted “Flight Qualified” status, and thus a spot on every crewed flight of the Apollo program from 1968 to 1972. The testing protocols developed by NASA put a handful of commercially available watches through a battery of tests that included exposure to extreme temperature, pressure, and shock, and while none would ace the testing, the Speedmaster came out the other end in arguably the best shape.
It’s important to note that none of the watches selected by NASA’s Procurement and Contracts Division were built with these tests in mind. The Speedmaster and the Daytona were both built with automotive racing in mind, and Hamilton provided a pocket watch for the ordeal, instantly disqualifying it from the proceedings. Point being, these weren’t watches designed for space travel.
With the next chapter of space travel and exploration unfolding before us, what would a watch look like were it built from the ground up to thrive in such environments? With the Barrelhand Monolith, we’re getting a look at just that, and like any good scientific instrumentation, the watch represents a starting point from which to learn and build upon. This is an open-source design, and the brand is actively seeking EVA Operations teams, engineers, and current or former astronauts to further validate and test the platform. So what exactly does a next-generation tool watch developed for space look like?
The Barrelhand Monolith is defined by its 38mm × 45mm × 11.8mm chassis. The striking design features large recesses and angular surfaces, and the entire thing is 3D-printed from Scalmalloy. This material is a modified aluminum alloy specifically designed for 3D printing, and is often used in aerospace applications thanks to its high tensile strength, thermal stability, and corrosion resistance. All prized qualities for an application such as this, and the fact that it can exceed titanium’s yield strength while clocking in at nearly half the weight, are another big plus. Spoiler alert: the watch (minus the strap) weighs just 31 grams.
The case uses Aircore insulation to protect against extreme temperature and pressure variations, as well as an “engine mount” shock-absorption system with a theoretical capability to withstand over 3,000 g. All of this protects the M1 engine, an automatic movement based on the Sellita SW300-1b, with a Glucydur balance beating at 4Hz and a nickel-phosphorus escape wheel and balance fork. It is amagnetic to ISO 764 / DIN8309 and is regulated to average +/-5 seconds per day in six positions.
The watch takes its name from the monolithic Aerolight X2 ceramic lume structure, designed with EVA use in mind and capable of withstanding temperatures ranging from -120 °C to 120 °C. This piece sits within a welded structure of brass plates, and there are no paints or adhesives in use. The composition is highly legible, and from an aesthetic standpoint, provides some depth to the dial, which, while not the point, is a welcome bit of architecture. A collaborator on dial production is none other than James Thompson, aka Black Badger.
Zooming in a bit further, we find a bevy of interesting details, all implemented holistically to achieve a high level of overall resilience. The caseback and strap bar are secured with Torx screws compatible with existing ISS toolsets. The sapphire is lab-grade C-plane with a magnesium fluoride coating to reduce glare. The 8mm airlock crown is operable with gloves and can be wound and set underwater. The custom hook strap has dedicated EVA and IVA modes.
Finally, turning the watch over will not reveal the movement or a closed engraved caseback, as you might expect. Instead, there is a rather curious-looking holographic disc that takes on a somewhat alien appearance upon closer inspection. This is the memory disc module, and it carries a 3 GB NanoFiche ‘cultural payload’ that will last 1,000 years or more. It includes 286 UNESCO preamble translations, curated global artworks, a visual sound artifact by Richard D. James, children’s paintings by R.O.C.K., and the original French edition of Le Petit Prince. The disc was produced using Stamper Technology and is created by engraving text and images into a thin, nickel-based film. It is a method for archiving and preserving information, and it feels like a fitting inclusion given the broader context of how this watch is intended to be used.
Obviously niche, highly specific, and retailing for $9,750, the Monolith represents a suite of carefully thought-out design and engineering solutions, all aimed at meeting and exceeding historic and modern spaceflight standards. A prototype of the finished watch has been subjected to a myriad of tests devised around six pillars: accuracy; pressure integrity; readability; shockproof, antimagnetic, and waterproof; capability of being manually wound and reset; and, finally, reliability. Barrelhand devised a series of tests to address each of these areas in-house, from using a pressure chamber subjecting the watch to extremes on each end, to a Kenmore 500 series washing machine to test acceleration. While initial orders of the Monolith have already reached early adopters, the next wave is now on pre-order and is slated for delivery in the fourth quarter of this year.
The results are flattering at a glance, with Barrelhand claiming EVA testing substantially exceeded both internal expectations and historical benchmarks. The next steps will involve third-party validation and eventual expansion of the concept to accept additional complications, such as a chronograph. This is where you come in. The assembly CAD files for the Monolith will be made publicly available to encourage independent review by the community and ultimately to develop more robust systems. The brand is also actively seeking collaborators from EVA Operations teams, engineers, and current or former astronauts to further evaluate and validate the platform. Editor’s Note: This also means you could 3D print a case blank of the Monolith on a household 3D printer. Stay tuned.
The Monolith represents a true old-school approach to creating a function-first tool watch. This isn’t a luxury or vanity project in the guise of a tool watch. It’s easy to be cynical about the state of modern tool watches, as many of the great historic examples occupy very different territory in their modern form. The reason watches like the Sea-Dweller or PloProf are so compelling to many of us today is because of the unusual circumstances of their origins many decades ago. Sadly, programs like SEALAB just don’t really exist anymore. But the recent reinvigoration of the space program represents new ground for applying the same core principles, and the idea of analog redundancies opens the door to a new generation of tool watches. The Monolith feels like a first look at that new generation.
Furthermore, the open-source nature of this project ensures a long-term growth trajectory that aligns with established scientific methodology. In addition to in-house testing, Berralhand continues to recognize the importance of independent third-party validation and peer review for the ultimate benefit of creating a better end result.
The inclusion of the memory disc module lends the watch deeper meaning than its mere use in our current generation of space programs. It invites a comparison with the plaques sent into space aboard Pioneer 10 and 11, as well as the golden records on the Voyager probes, which are still traveling today beyond the outer reaches of the solar system. As the late Carl Sagan said, “Our obligation to survive is owed not just to ourselves but also to that Cosmos, ancient and vast, from which we spring.” As such, the Monolith (setting aside the nod to Arthur C. Clarke’s 2001: A Space Odyssey) represents hope in our eventual expansion to the stars and our ability to get there.
Whatever the case may be for the future of deep-space travel, the story of watches like the Monolith is reinvigorating to the genre as a whole and is a much-needed reset for the idea of what a tool watch is and can be.
The Basics
Brand: Barrelhand
Model: Monolith
Diameter: 38mm
Thickness: 11.8mm
Lug-to-lug: 45mm
Weight: 31g (without strap)
Case Material: Scalmalloy (3D-printed)
Dial Color: Black
Indexes: Applied
Lume: Hands and markers
Water Resistance: 200 meters (also tested at 0 ATM, in a vacuum)
Strap/Bracelet: fabric strap with grade-5 titanium hook closure
The Movement
Caliber: M1 Engine (Sellita SW300-1b base)
Functions: Hours, minutes, seconds
Power Reserve: 50 hours
Winding: Automatic
Frequency: 4 Hz, 28,800 vph
Chronometer Certified: No
Additional Details: Anti-magnetic to ISO 764 / DIN 8309, includes movement mount for omnidirectional shock absorption
Pricing & Availability
Price: $9,750
Availability: Pre-order, deliveries slated for Q4 2026.
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