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Alpina 490A
Basic Information
| Name | Alpina 490A |
|---|---|
| Manufacturer | Alpina |
| Launch Year | 1935 |
| Is COSC certified | No |
Timegrapher
Beat rate
18,000 bph
Frequency
2.5 Hz
Reference: healthy amplitude ≈ 270–315° fully wound (>200° at 24 h); beat error ideally < 0.5 ms.
Technical Details
| Lignes Dimensions | 8.75 ‴ x 12 ‴ |
|---|---|
| Dimensions | 19.74 mm x 27.07 mm |
| Height | 3.8 mm |
| Further Measures | Mounting Diameter (Dm): 19.35 x 26.3mm |
| Power Reserve | 45 hours |
| Frequency | 18,000 vph |
| Jewels | 15 |
Complications and Specifications
| Shape | Square |
|---|---|
| Complications |
|
| Regulator Type | Pinned Regulator (or Index Regulator) |
| Movement Type | Manual |
| Escapement Type | Swiss Lever |
| Control Type | Balance Wheel |
| Winding Type | Stem Winding (Crown) |
| Setting Type | Stem Set (Crown Pull) |
Additional Information
| Hand Sizes | 1.50 x 0.70 / 0.20mm |
|---|---|
| Hand Count | 3 |
| Country Of Manufacture | Switzerland |
| Notes | Remarks: straight lever (ligne angulaire) differences not known between 490, 490A Other data: balance staff: U1704 stem: W2063 mainspring / battery: Zf873, 1.30 x 10.0 x 0.11 x 320mm swiss patent 158882: filed 11-21-1931, Straub & Co. Fabriques des Montres Alpina (CH) lever for secure fixing of the stem in the movement, as long as it is in the case shell (lever in Fig.3) |
| Signature | ca. 1935: 224282, Alpina 490A - Pat.+158882 (under barrel bridge) |
Compatible Parts
No parts linked yet for this caliber.
Metadata
| Created At | Sep 15, 2023 |
|---|---|
| Updated At | Jan 28, 2024, 11:31:28 PM |
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