It's to tell you if it's AM or PM as a 12 hour dial doesn't differentiate (except just before midnight when the date starts to change).
The small 24 under the 6 could denote 24 hour but then I'm not sure what the 11 would refer to.
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I agree with Roy. The main dial displays a time of 10.11 and 24 seconds, which tallies with that of the smaller dial whose hand is just past 10.
As to being able to distinguish between AM and PM, well that should be obvious, unless one is in either the Arctic or Antarctica! :lol:
I have one watch with that feature
https://uploads.tapatalk-cdn.com/202...04ab9d6909.jpg
And another that tells you if it’s day or night
https://uploads.tapatalk-cdn.com/202...22f36dcda4.jpg
I'm now intrigued as to how the display on the second watch indicates day and night.
The 'Cole Porter' watch.
Hole displays white at day black at night.
https://uploads.tapatalk-cdn.com/202...2b2e209083.jpg
The virtual display on my sat-nav changes from 'day' to 'night' accordingly with the time.