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ETA 840
Jewels: 15
Power Reserve: 34 hrs
Frequency: 18000 vph
Type: Manual Wind
Period used: 1899-1903
Diameter: 43.1 mm
Height: 6.65 mm
Hands: 1.65 x 0.92 / 0.25 mm
The ETA 840 watch movement, produced between 1899 and 1903 with a total of 22,500 units, is an open face calibre model 7. It features a bimetallic screw balance and a Breguet hairspring, ensuring precise timekeeping. The movement incorporates a negative stem mechanism, enabling the seamless switching between winding and setting functions by either the crown or the lever. Additionally, it includes a sub second feature.
The ETA 840 features the following functions:
- Stem wind, switching by crown or lever
- Sub Second
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
|---|
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 2.64 x 0.190 x 560 x 16.0 mm | Manual | Buy mainspring |
Incabloc Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
KIF Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
Documents
Parts Listing
| Part Description | Reference # | Alternate | Buy |
|---|---|---|---|
| SCREW, BALANCE JEWEL UPPER | 2049/ELG | Buy part |
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