An Invitation to the Inner Circle
In an age that worships the digital, Jiro Katayama builds watches that refuse to apologise for being machines.
From a small atelier in the Otsuka neighbourhood of Tokyo — a quiet residential pocket where watchmaking is practised not as industry, but as conviction — Katayama has built one of the most singular bodies of work in contemporary independent horology. There are no marketing departments here. No polished manufacture tours. There is a bench, a set of manual machines, and a single maker’s insistence that a timepiece should wear its engineering on its face.
At Beckham Intemporel, this is the kind of maker we exist to find. The Otsuka Lōtec No. 7.5 is the result: a mechanical instrument panel for the wrist, lottery-allocated, Japan-exclusive, and produced in numbers so small that most collectors will never encounter one at all.
Le Temps, est Intemporel
The Low-Tech Ethos — A Mechanical Autograph
Katayama’s philosophy is a deliberate refusal of high-tech convenience. His movements are built on a base caliber, then re-engineered by hand with proprietary modules — most famously an instantaneous jump-hour mechanism executed in raw, unapologetic mechanics. The aesthetic is that of an analog instrument panel: gauges, lenses, and readouts that celebrate the act of measuring time rather than concealing it.
The low-tech ethos is not nostalgia. It is a mechanical autograph in an increasingly digital world. In a market saturated with smart-everything, a watch that celebrates visible, audible, honest mechanics becomes a statement object — and statement objects hold collector floors that commodity references cannot approach.
The No. 7.5 — The Instrument Panel
The No. 7.5 abandons the traditional hand-set entirely. Time is read through three magnified sapphire lenses set into the dial — fisheye portholes that turn the measurement of hours and minutes into an act of looking into the machine. This is not a watch designed to be glanced at. It is designed to be witnessed.
At the heart of the movement sits a Miyota 82S5 base, re-engineered with a proprietary instantaneous jump-hour module of Katayama’s own design. The jump is mechanical, immediate, and audible — a snap rather than a creep. The hour disc does not drift; it commits. Among jump-hour independents, the crispness of that snap is the maker’s calling card.
The retrograde minutes complete the picture: the minute hand sweeps an arc and snaps back to zero at the hour’s turn, in perfect mechanical counterpoint to the jump above. Every element of the dial is engineered to be seen. There is nothing here that hides.
You do not read this watch. You look through it.
The Asaoka Partnership — Institutional Gravity
In 2022, Katayama entered a formal partnership with Hajime Asaoka — the GPHG-recognised independent behind the Tourbillon No. 1 and the AK/0 series, whose tourbillons trade well into six figures. The alliance placed Otsuka Lōtec within one of Japan’s most respected independent houses, lending the brand the institutional gravity of a maker whose work the collector community has already validated at the highest level.
For the Beckham Intemporel collector, this matters. Katayama’s work now carries the endorsement of a GPHG-winning house — not as a marketing arrangement, but as a genuine creative and institutional partnership between two makers who share a commitment to mechanical honesty.
200 Pieces Per Year — Lottery Only
Otsuka Lōtec watches are Japan-exclusive releases, allocated by lottery only. Production is capped at approximately 200 pieces per year across the entire line — a volume that places the brand among the scarcest working independents in the world.
A No. 7.5 does not sit in a display case waiting to be bought. It is drawn for, applied to, and rarely surfaces outside Japan. By the time one appears on the secondary market, it has already passed through a gate most collectors never see. This is scarcity fixed at the source — not by marketing, but by the physical limits of a single maker’s output.
The example available at Beckham Intemporel arrives brand new, full set, with box and papers. The cleanest possible entry point into the Otsuka Lōtec line.
A Final Word for the Collector
There is a particular charge to a Katayama piece. The moment the jump-hour snaps and the retrograde minute springs back to zero, the watch announces itself as a machine that is alive. It is the electric sensation of raw mechanics: not the silent glide of a luxury movement, but the honest, audible report of gears doing exactly what they were built to do.
For the collector who has tired of perfection without character, the No. 7.5 is the antidote. It does not whisper. It speaks. And for the collector who understands that the most interesting names in horology are often the ones the wider world has not yet discovered, Jiro Katayama is a name worth knowing now.
Discover the Art of Rare Time.
Acquire the Otsuka Lōtec No. 7.5 — Jumping Hour | Jiro Katayama
Brand new. Full set. Available now in the Beckham Intemporel collection. Enquire or purchase directly here.
Le Temps, est Intemporel