Eta 735 complete balance 721

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.

Balance with Hairspring

A balance with hairspring is a key regulating assembly in a mechanical watch movement. The balance wheel and hairspring work together to control the rhythm of the movement, directly affecting accuracy and stability. These assemblies are often used in repairs when the original balance, hairspring, or pivots are damaged, worn, magnetized, or no longer performing correctly.