Eta 735 escapment wheel 705

ETA

Founded in 1793, ETA SA Manufacture Horlogère Suisse is the largest manufacturer of watch movements in Switzerland, a subsidiary of the Swatch Group. ETA movements are the backbone of the Swiss watch industry, powering countless watches from entry-level to luxury brands. While not producing watches under its own name, its movements are legendary for their reliability, accuracy, and ease of service. Famous movements include the automatic ETA 2824-2, the chronograph ETA 7750 Valjoux, and the Powermatic 80, known for its extended power reserve. ETA's contribution to horology is foundational, ensuring the continued success of Swiss watchmaking.

Wheel

Wheels are essential rotating components in a watch movement, used to transfer power, motion, and timing between different mechanisms. They appear throughout the gear train, winding system, setting system, calendar, chronograph, and automatic winding works. Wheels may be replaced when teeth, pivots, spokes, or friction surfaces are worn, bent, broken, corroded, or causing poor performance.