The watch on Linus Brisecq's wrist has a plain cream dial, twelve slim markers and a single hand. It tells him that it is a little after half past three, give or take a few minutes, and that, he says, is all anyone really needs to know. Brisecq Horlogerie, the workshop he founded nine years ago in the Vallee de Joux, the Swiss valley that has been home to fine watchmaking for three centuries, produces around four hundred single-hand watches a year.

The concept is not new. The earliest mechanical clocks and pocket watches had only an hour hand, because their movements were not accurate enough to justify a minute hand. Brisecq sees his work as a deliberate return to that softer, more approximate way of reading time. A single hand sweeping slowly across a dial divided into five-minute intervals invites you to estimate rather than calculate. He calls it telling the time in the conditional tense.

Precision, reconsidered

That might sound like a gimmick, but the watches are serious pieces of engineering. Each hand-wound movement is finished to the standards of the valley's most revered houses, with bevelled bridges, polished screws and a balance wheel beating at a gentle two and a half hertz. The cases are made in a neighbouring village by a family firm that has supplied watchmakers for four generations. A basic model costs roughly as much as a good second-hand car.

We spend our lives being told the exact minute. I wanted to make something that lets you round up. — Linus Brisecq

His customers, Brisecq says, fall into two groups. The first are collectors who already own complicated watches and want something that feels like a palate cleanser. The second are people who have never bought a mechanical watch and are drawn to an object that slows them down. Many of them, he notes, work in professions governed by the clock: surgeons, air traffic controllers, trial lawyers.

Living with one takes adjustment. For the first week I found myself squinting at the dial, trying to decide whether it was seven minutes past or nine. By the second week I had stopped caring. The watch was accurate enough to catch trains and arrive at meetings, and its gentle vagueness made the rest of the day feel less partitioned. I checked my phone less often, which may have been the real point.

Brisecq knows his watches are, strictly speaking, unnecessary. So, he points out, is every mechanical watch made today, when a phone offers perfect accuracy for nothing. The value of a fine watch has always lived elsewhere: in craftsmanship, in beauty, in the pleasure of wearing something built to outlast its owner. His single hand simply makes that argument more honestly than most.

The workshop has no plans to grow. Brisecq employs eleven watchmakers and turns down wholesale requests from department stores in several countries, preferring to sell directly and to meet as many clients as he can. When I asked him the time as I left, he glanced at his wrist, smiled and said it was nearly four. That, I realised on the train home, was precise enough.