I have always asked the same, and in search for the answer I have found the “24 hours watches” (I almost bought a Glycine Airman).
Most of them come from Russia, since there are places that have weeks without daylight so it’s harder to know if is am or pm.
Also there are some that have the 12’ on top so when the sun is at the top of the sky all the clock indicators at pointing upward.
[More info](https://vintagewatchinc.com/24-hour-watch/)
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