Kintao exists to refine ideas watchmaking left behind. One of them led to our first watch, the Chapter 1, and its internal rotating bezel controlled by the Unicrown system, patent pending.
Today, a walk through the heritage of internal bezel watches: their ingenuity, their flaws, and how we improved the concept for today’s wearer.
The Friction Route: Japan, 1961
In 1961 a Japanese maker introduced one of the world’s earliest watches with an internal rotating bezel controlled by a single crown. The design offered a slimmer case and protection from accidental bezel movement.
But the bezel was friction-based, making precise adjustment difficult. Over time it loosened and lost accuracy. The same maker’s 1964 world-time model used the same elegant concept and met the same fate: friction bezels degrade, and reliability suffers.
The Geared Route: Geneva, 1962
Around the same era, a Geneva dive-watch maker went further. Their 1962 patent (CH378232A) geared the bezel directly to the winding stem: a pinion on the stem meshed into teeth cut into the ring. It didn’t slip and it didn’t drift. They had thought about separating the two, as well: the patent describes a version where the pinion leaves the bezel teeth when you pull the stem. What the Unicrown changes is how you choose — not by pulling the crown out, but by which way you turn it, at one position.
Modern Single-Crown Bezels: Still Facing Friction
Decades later, brands continue experimenting with single-crown internal bezels, from dress world-timers to dive watches. Most still use friction mechanisms, so users still experience imprecise alignment, accidental shifts, and limited long-term reliability.
The Problem with Two-Crown Solutions
Recognising these limits, many watchmakers turned to two-crown designs. They offer slightly better control, but bring new compromises: extra bulk, more visual clutter, reduced comfort, and bezels that are still largely friction-based.
Dive Watches: Overbuilt for Everyday Life
Many watches with external rotating bezels are built for extreme underwater use that few people ever encounter. They tend to be heavy and bulky under a shirt cuff. For timing a meeting or a cooking interval, a heavy dive bezel feels like more than the task needs.
Chapter 1: The Unicrown Solution
Understanding these limits, we built something new. At 11 mm thick, Chapter 1 integrates the Unicrown system, combining hand-winding, 120-click bezel rotation, and time — or time and date — through a single crown.
Unlike friction bezels, ours uses a clear, tactile 120-click system. Each turn is precise and reliable. Bezel adjustment (counter-clockwise) is cleanly separated from winding (clockwise), removing confusion, slippage, and accidental movement.
The bezel stays exactly where you set it.
What the originals promised
We kept what the 1960s originals got right and replaced what failed. The result is an internal bezel that works the way the originals promised.
— The Kintao Team