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AS 1257
Basic Information
| Name | AS 1257 |
|---|---|
| Manufacturer | AS |
| Launch Year | 1945 |
| 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 | 5.5 ‴ x 7 ‴ |
|---|---|
| Dimensions | 12.2 mm x 16 mm |
| Height | 3 mm |
| Further Measures | Mounting Diameter (Dm): 12.2 x 15.5mm Stem height (T): 1.5mm Mounting Height (F): 0.5mm |
| Power Reserve | 36 hours |
| Frequency | 18,000 vph |
| Jewels | 17 |
Complications and Specifications
| Shape | Rectangle |
|---|---|
| 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 | 1.00 x 0.55mm |
|---|---|
| Hand Count | 2 |
| Country Of Manufacture | Switzerland |
| Notes | Remarks: differences not known between 1234, 1257, 1278, 1289 Other data: balance staff: U1506 stem: W1184 mainspring / battery: Zf905, 1.35 x 6.0 x 0.06 x 210mm balance staff ronda: 111 (5) stem ronda: 161 (5) Mainspring: 1.350 x 6.000 x 0.060 x 220.000 mm |
| Signature | ca. 1945: Swiss Made, 17 Jewels (AS 1234) |
Compatible Parts
No parts linked yet for this caliber.
Metadata
| Created At | Sep 15, 2023 |
|---|---|
| Updated At | Apr 23, 2025, 11:30:58 PM |
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