What do sub dials on watches mean?

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Tags

1. #calendar
2. #subdial
3. #features
4. #dials
5. #subdials
6. #common
7. #inside
8. #placed
9. #chronographs
10. #watch
11. #subsidiary
12. #alarm
13. #called
14. #watches
15. #small
16. #auxiliary
17. #information
18. #provided
19. #multifunction