2550 — the 24xx family at a higher beat

In brief

21,600 vibrations an hour, against the 18,000 of the 2452 and 2472 before it. The 2550 is the later generation of the family, and the increase follows the general drift of the Swiss industry towards higher beat rates through the 1960s and 70s.

Short history

The step from 18,000 to 21,600 vibrations an hour that separates the 2550 from its predecessors belongs to the same race for perceived accuracy that ran through all of Swiss mechanical watchmaking in those years — before the quartz crisis rearranged the industry's priorities.

Watches that used it

• Certina
• Tissot