The Cal. 1240 family of movements by Frédéric Piguet (later Manufacture Blancpain) are a series of alarm calibres. Measuring 31.70 mm (12 ligne) in diameter, they feature a single power barrel and have been updated with a silicon balance spring.
| Name | Diam. | Height | Power Reserve (Hours) | Jewels | Parts | Speed Hz. | Silicon Balance Spring | Features |
|---|---|---|---|---|---|---|---|---|
| 1240H | 31.70 | 6.20 | 45 | 36 | 392 | 4 | Yes | Alarm, Double Timezone, Alarm Power Reserve, Date |
| 1241H | 31.70 | 6.20 | 45 | 38 | 407 | 4 | Alarm, Double Timezone, Alarm Power Reserve, Date, Small Seconds | |
| 1241G | 31.70 | 6.20 | 45 | 38 | 405 | 4 | Alarm, Double Timezone, Alarm Power Reserve, Date, Small Seconds | |