It's interesting to note how the caseback of a Rolex differs from most other watches.
Notice how the Rolex caseback is completely devoid of notches and would require a very special Rolex engineered tool to perfectly fit that fine milling at the back in order to unscrew it.
On the other hand, most watches, like the OMEGA caseback pictured below, would require a standardised watchmaker's tool to unscrew the back. Some watches have 5 notches whereas others might have 6. Interesting, uh?
