Rolex Back Remover Tool
Works on my 32 mm Oyster Datejust Perpetual but not on any other sizes or styles unless you scale it up. No guarantees as the inside serration may not lock onto your watch backs' serrations.
Normally you would use a rubber ball, circular rubber patch, monkey wrench, pliers or something but this is a little more precise and convenient and, of course, can't scratch your Rolex.
Why would you want to take the back off your Rolex? Dunno. Curiosity. To watch (pun) the rotor spin as you wave it around. Maybe you suspect it's a replica. Maybe - like me - because you can…
Regards, Paul.
The author hasn't provided the model origin yet.