A watch is said to have a big date when the wickets as well as the date digits are oversized and carried by 2 separate disks.
Chronograph 3 counters
Complicated watch with a function for measuring short time periods in addition to its function for permanently displaying hours, minutes and seconds.
30 min counter
A counter which tracks minutes, it completes a full rotation in thirty minutes.
A hand which tracks hours, it completes a full rotation in twelve hours.
Stop second device and switch
Function to stop second device and switch.
A hand on a sub-dial which tracks seconds typically it completes a full rotation in one minute.
A hand which tracks minutes, it completes a full rotation in sixty minutes.
Function to 1/10 second.
1/10 sec up to 30 min
Function to 1/10 sec up to 30 min.
10 hour counter
A counter which tracks hours, it completes a full rotation in ten hours.
ADD and SPLIT
Function to ADD and SPLIT.