On a watch, marking is not decoration: it is documentation. Every engraving, print, or application on the dial, case, or caseback certifies something — the origin, the material, the intended use, the ownership. Ignoring it means reading a text while skipping the footnotes.
Origin markings are the most common. «Swiss Made» on the dial has legal value: Swiss legislation requires that at least 60% of production costs occur in Switzerland and that the movement is certified Swiss. Some manufactures prefer their own variants: Louis Vuitton writes «Fab. En Suisse» on the Escale dial, explicitly linking the watch to the La Fabrique du Temps manufacture. Omega used «T SWISS MADE T» or «SWISS MADE» on the Speedmaster 105.003 depending on the serial number, and that variation today guides the dating of vintage examples. «OM» engraved on a Speedmaster dial instead stands for «Or Massif»: solid gold, not plated.
Title markings concern precious metals. «Au 916» on a rotor indicates an alloy of 91.6% pure gold, corresponding to 22 carats. On the caseback of a 1930s American Curvex, the «W» identifies the case manufacturer — Wadsworth Watch Case Co. — and was always accompanied by the hallmark of the gold fineness.
In military context, marking becomes code. The Broad Arrow, also called Pheon, is the heraldic symbol of the British Crown: engraved on the Dirty Dozen watches of World War II, it certifies that the watch was property of the British government. On the same family of watches appears «W W W» — Wrist Watch Waterproof — as a standardized functional indication. Dials lumed with tritium bear «T», «T 25», or «3H»: markings born to distinguish tritium from radium, banned in the United States since 1968. Laco pilot watches display «Beobachtungsuhr» (observation watch), «Flieger», and the Luftwaffe contract number FL 23883 — a military traceability system that today allows verification of the authenticity of original examples.
The cartouche method is a historic dial marking technique: a small metal plaque was engraved with the brand name or with numerical indices, then applied to the surface. Some manufactures still use it. The «chemin de fer» — literally railway — is instead a graphic marking: a band of regular segments running along the edge of the dial or bezel, used to mark minutes and seconds with optical precision. The term indicates both the motif and the application technique.
The term «double-signed» appears when two distinct marks figure on case or dial. On the Grand Seiko SBGS009 both «Seiko» and «Grand Seiko» are engraved: a transition marking that documents the moment when Grand Seiko acquired its own commercial independence. For those who work with vintage watches, these overlapping signatures are precise chronological clues.