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AS 1287
Basic Information
| Name | AS 1287 |
|---|---|
| Manufacturer | AS |
| Launch Year | 1940 |
| Caliber Family | Description 1287, 1497: 10.5" 1255, 1294, 1494: 11.5" Related calibers AS 1255, AS 1287, AS 1294, AS 1494, AS 1497 |
| Is COSC certified | No |
Timegrapher
Beat rate
18,000 bph
Frequency
2.5 Hz
Lift angle
52 degrees
Reference: healthy amplitude ≈ 270–315° fully wound (>200° at 24 h); beat error ideally < 0.5 ms.
Technical Details
| Lignes Dimensions | 10.5 ‴ |
|---|---|
| Dimensions | 23.7 mm |
| Height | 4.5 mm |
| Further Measures | Mounting Diameter (Dm): 23.3mm Mounting Height (F): 1.1mm |
| Power Reserve | 40 hours |
| Frequency | 18,000 vph |
| Jewels | 17 |
| Lift Angle | 52 degrees |
Complications and Specifications
| Shape | Round |
|---|---|
| Complications |
|
| Shock Protection | Incabloc |
| 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 | 1.31 x 0.85 x 0.22mm |
|---|---|
| Hand Count | 3 |
| Country Of Manufacture | Switzerland |
| Notes | Remarks: differences not known between 1287, 1497 Other data: balance staff: U1512 stem: W1149 mainspring / battery: Zf1211, 1.50 x 9.0 x 0.10 x 290mm balance staff ronda: 5451 (10,5) balance staff ronda: 5305 (10,5) balance staff ronda: 173 (10,5-11,5) stem ronda: 80 (10,5) Mainspring: 1.500 x 9.000 x 0.105 x 280.000 mm Ranfft mentioned about this caliber: There are variants with this quantity of jewels 15, 17 |
| Signature | 1-2) ca. 1940: Olma, Swiss Made, 15 Jewels - AS, 1287, 1294, Brevet + Dep. 3) ca. 1960: Musette, Swiss, 17 Rubis; Incabloc |
Compatible Parts
1566 other caliber(s) share compatible parts with this caliber.
90 compatible part(s) available — Supporter feature.
Metadata
| Created At | Sep 15, 2023 |
|---|---|
| Updated At | Apr 23, 2025, 11:30:58 PM |
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