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This is a genuine Swiss-made ETA 2892-721 balance complete (part no. 721), a core regulating component for calibers 2892 and 2892-A2. Made of classic Glucydur beryllium‑bronze alloy and equipped with the Etachron fine‑regulation system, this balance assembly is pre‑poised and pre‑timed at the factory.
It serves as a direct OEM replacement, ideal for full movement overhauls or repairing a damaged balance. Supplied brand‑new in original factory packaging, it offers the best possible guarantee for the movement‘s precision timekeeping.
Genuine ETA Part – Factory original, not a copy or refurbished unit.
Glucydur Material – Classic beryllium‑bronze alloy, anti‑magnetic, corrosion‑resistant, thermally stable.
Etachron Fine Regulation – Eccentric screw system for precise rate adjustment.
Pre‑poised and Pre‑timed – Factory balanced and preliminarily adjusted; only fine tuning required after installation.
Direct OEM Replacement – Perfect fit for 2892/2892-A2 movements, no modification needed.
| Parameter | Details |
|---|---|
| Part Name | Balance complete |
| Part Number | ETA 2892-721 |
| Compatible Movements | ETA 2892, 2892-A2 |
| Material | Glucydur (beryllium‑bronze) |
| Regulation System | Etachron (eccentric screw) |
| Condition | Brand new, original packaging |
| Origin | Switzerland |
1. Is this a genuine ETA balance wheel?
Yes. It is a factory-original ETA part (no. 2892-721) for 2892/2892-A2 movements, not a third-party copy.
2. Does it need dynamic balancing after installation?
No. It comes pre‑poised from the factory. Only fine rate adjustment using the Etachron system is required.
3. Which movements does this balance fit?
It fits ETA 2892 and 2892-A2 automatic calibers. Not compatible with 2824, 7750, or other non‑2892 based movements.
4. What should I pay attention to during installation?
Install the balance complete together with its bridge. Ensure both balance pivots drop into their jewel holes. Follow the ETA technical guide. Professional installation is strongly recommended.
5. When should I replace the balance wheel?
Common reasons: broken balance staff, deformed balance wheel, tangled or sticking hairspring, or severe imbalance that cannot be corrected. If cleaning and lubrication cannot restore accuracy, replacement is advised.
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