This puzzle is part of the original puzzle crime story "Detective Sanders and the Zodiac Killer". You can read the full story HERE, exclusively on Puzzle Prime.
There is something odd with one of the watches below. Which one?
The fourth watch is placed upside down. You can see this by noticing that its wristband holes are on the top, and also there is large space between the "1" and the "2" on the screen, which wouldn't be the case if the orientation was normal.