| Period | 6 hours with the chronograph in action, 18 hours chronograph out of action |
| Position | Dial vertical / pendant up and dial horizontal / face uppermost |
| Temperature | 15 degrees C. |
| Permissable errors irrespective of whether the chronograph movement is in or out of action | 10 minutes - 1 second
1 hour - 5 seconds 6 hours - 20 seconds 24 hours - 60 seconds |
Additional tests at -20 degrees C. and + 50 degrees C. for 3 hours with
the chronograph in action followed by 3 hours with the chronograph out
of action. Permissable errors as above.