Albishorn Thundergraph Khumbu: A COSC-Certified Monopusher Chronograph for the Himalaya, Now on a Steel Bracelet (LE 99, CHF 3,650)

Albishorn Thundergraph Khumbu — green-dial COSC monopusher chronograph for high-altitude exploration

Description

Albishorn is one of the small Swiss indies that has spent the last few years carving out a very specific lane: "imaginary vintage" — watches designed to look as if they had been pulled out of a 1950s expedition kit, except the expedition never actually happened. The Thundergraph line is the brand's centrepiece, a monopusher chronograph with the kind of asymmetric case proportions and military-grade fonts that scream Cold-War-era tool watch. Today's Albishorn Thundergraph Khumbu takes the format somewhere new: high-altitude exploration. The dial is a deep, hand-painted-looking green inspired by the Khumbu region of north-eastern Nepal — the staging valley below Everest — and the watch is now offered, for the first time in the Thundergraph line, on a stainless-steel bracelet.

This is a 99-piece limited edition, sold exclusively online at albishorn-watches.ch from April 2, 2026. The chronograph movement inside is COSC-certified — a rare claim at this price point — and the case is built around a design choice that is going to divide opinion: the crown sits at 10:30 and the monopusher chronograph at 9:30, both deliberately placed for use while wearing thick gloves with the right hand. It is unusual, it is practical, and it is one of the most charming small details in current independent watchmaking.

Pricing is CHF 3,650 on leather and CHF 4,100 on the new steel bracelet. For a Swiss-made COSC-certified monopusher chronograph with a 65-hour power reserve in a 99-piece limited edition, this is genuinely outstanding value.

Design

The case measures 39 mm in diameter and 12 mm thick (including the box-shaped sapphire crystal), in stainless steel with a mix of brushed and polished surfaces. The crown — for setting and winding — is at 10:30, and the monopusher button that drives the chronograph is at 9:30. Albishorn's reasoning is straightforward: a right-handed wearer with the watch on the left wrist can operate both controls with the right thumb without removing gloves. It is the kind of "is this really useful or just charming?" detail that, on a watch this thoughtful, ends up being both.

The dial is the obvious centrepiece. The Khumbu green is matte and slightly textured, with off-white printed indices, vintage-style lume on cathedral hands, and the recessed sub-dial at 6 o'clock for the chronograph 30-minute totaliser. The minute track is military-spec, and the seconds chronograph hand has an open-worked counterweight. Crown and monopusher are both ribbed for grip with gloves.

The bracelet — new for the Khumbu — is a brushed steel design with screwed (not pinned) links and an integrated extension system in the clasp. For a brand that has so far only sold its Thundergraphs on leather, this is a meaningful upgrade and pushes the watch into proper everyday-tool-watch territory. Two leather strap options remain available at the lower CHF 3,650 price point.

Specifications

Reference: Albishorn Thundergraph Khumbu (limited to 99 pieces)
Case size & material: 39 mm × 12 mm (including sapphire), stainless steel
Crown / Pusher: Crown at 10:30, monopusher chronograph at 9:30 (designed for glove operation)
Crystal: Box-shaped sapphire with anti-reflective coating
Dial: Khumbu-green matte, vintage-style cathedral hands, sub-dial chronograph minute counter at 6 o'clock
Movement: Calibre ALB03 M — proprietary, COSC-certified, hand-wound monopusher chronograph
Movement base: Reworked Sellita SW510M Mp with cam-lever monopusher construction (Valjoux 7750 architecture)
Frequency: 28,800 vph (4 Hz)
Power reserve: 65 hours
Strap/Bracelet: Two leather strap options or new stainless-steel bracelet with screwed links and integrated extension system
Limited edition: 99 pieces
Price: CHF 3,650 (leather) / CHF 4,100 (steel bracelet)
Availability: Online only at albishorn-watches.ch, from April 2, 2026

Albishorn Thundergraph Khumbu — wrist shot on the new steel bracelet showing crown-at-10:30 layout

What's Exciting

The headline is that COSC certification at this price. Most CHF 3,500–4,000 chronographs are Sellita- or ETA-based without chronometer testing, because the certification cost typically eats too much margin at that segment. Albishorn pushes the calibre ALB03 M through the standard 15-day, five-position COSC test and then sells the result for less than what some brands charge for a non-COSC base movement. For watch buyers who care about chronometric performance — and the small subset who care about the COSC certificate as a formal document — this is a meaningful technical claim, not marketing.

The second exciting thing is the monopusher format itself. A monopusher chronograph — start, stop, and reset all driven from a single pusher — is mechanically harder to engineer than a two-pusher, because the cam-lever architecture has to do three jobs from one input. Albishorn's calibre is built on the Sellita SW510M Mp platform but heavily reworked, and the result is one of the most affordable monopusher chronographs from a real Swiss workshop. Pair that with the 65-hour power reserve (well above the typical 48-hour ETA-based monopusher) and the value proposition gets very strong.

And the third is the dial story. Watch dials inspired by mountain regions have become a genre — Yema MoonTide, Bremont Terra Nova, every brand's Everest commemorative — but the Khumbu earns its name. The green is restrained, slightly faded, and tonally accurate to the high-altitude meadow grasses below the Everest base camp area. It is one of the most photogenic green dials of 2026 specifically because it is not loud.

History

Albishorn was founded in 2023 as a tiny Swiss workshop with one core idea: design watches that look like they belong to a vintage past that never existed, but build them to modern Swiss-made standards. The brand's first piece was the Type 10 pilot's chronograph (a fictional 1940s flight watch), followed by the Marinagraph (a fictional 1960s skin-diver chronograph), and the original Thundergraph in 2025 — an "imaginary vintage" alpine chronograph in California-dial format. Each Thundergraph release since has been a single dial colourway in a small limited run, sold exclusively through albishorn-watches.ch.

The Khumbu is the third Thundergraph variant, after the original blue and the Himalaya. It is also the first to ship with a steel bracelet option, signalling a genuine commitment to the line as a daily-wear tool watch rather than a leather-only collector piece. Albishorn is run by a small team out of the Jura, with movements reworked in-house from the Sellita base. The brand has been a regular fixture in the SJX, Worn & Wound, and Monochrome "indie watch to watch" coverage — the kind of microbrand that, like Massena LAB or Anordain, has built its reputation through editorial validation rather than mass marketing.