Craft
Cut to a tolerance. Set to a geometry.
Every house says the work is exact. This page does not say it. It shows the four operations a piece passes before it is finished, and the single number each one is held to.
01/Measure
The Rate
A movement is timed before it is cased, not after. It is held on the timing machine and read in every position a wrist will hold it. The rate is adjusted at the balance until it holds true across all of them, then read again to confirm the adjustment did not drift.
Rate held within +/- 5 seconds per day, in every position.
02/Cut
The Edge
A case is machined to its dimension, then finished by hand where the machine leaves a mark. The bevel is filed and polished in a single continuous pass, so the angle catches light as one line and not as a series of facets. Anglage is the last operation, applied only after the geometry is signed off.
Geometry machined to +/- 0.02 mm before the bevel is cut.
03/Set
The Seat
Each stone is seated to its collet once. The seat is cut to the stone, not the stone to the seat, and the metal is closed over the girdle by hand until the stone is held without a gap. A stone that shifts under the loupe is unseated and the seat is recut. Nothing is re-tipped to save a setting.
Each stone examined under loupe, matched, and seated once.
04/Finish
The Field
A dial is engraved on the rose engine, one continuous line at a time, so the guilloché reads as a single field and not a printed pattern. The surfaces that face inward are finished to the same standard as the dial. The last pass is the one no owner will ever see.
Guilloché cut by hand on the rose engine, line by line.
The result
The work is confirmed at the bench. Then it is confirmed again in the object.
Four operations, four numbers. A piece that passes all four is finished. A piece that misses one is not offered until it does.
Draft process account. The technique names and tolerance figures on this page use real horological vocabulary as placeholders. Replace each with the verified OTMOS bench process before launch.