Understanding & Servicing ETA & Sellita Movements: Understand, Diagnose and Service the Movements Behind 80% of Swiss Watchmaking — From the 6497 to the 7750 Chronograph, Step by Step

Master the movements behind 80% of Swiss watchmaking.Most affordable Swiss mechanical watches share the same engine: an ETA caliber or its Sellita twin. Learning the movements rather than the brands hands you the key to thousands of watches. This hands-on manual takes you from theory to hands-on work, following the real progression of the watchmaker.A step-by-step progression in four levels and seven parts:Understand ETA, Sellita and the "ébauche war", the anatomy of a movement and the path of energy, then set up your bench.Level 1 — the ETA 6497 school caliber: teardown, cleaning, lubrication and a first regulation on the Timegrapher.Level 2 — the benchmark automatic ETA 2824-2 (and its Sellita SW200 twin): the winding module, reversing wheels, Etachron regulation and five positions.Level 3 — the 2836-2 day-date calendar and the ultra-thin premium 2892-A2, plus ETA / Sellita parts interchangeability.Level 4 — the Valjoux 7750 chronograph: cam actuation, oscillating pinion, and the reset of hearts and hammers.Timegrapher diagnosis, ETA quartz calibers, water-resistance, sourcing, ethics and pricing.Workshop reference: caliber spec sheets, lubrication map, regulating targets, checklists, glossary. Around 300 pages, dozens of diagrams and step-by-step procedures, safety call-outs and ready-to-use checklists.Never force it: understand first, then repair.An independent, unofficial guide, not affiliated with ETA SA, the Swatch Group or Sellita Watch Co. "ETA", "Sellita", "Valjoux" and other names are trademarks of their owners, used here descriptively. Read more