An Outboard Marine Corporation (OMC) pinion and bearing kit for boat motors.
If you are looking for a complete Rolex watch with a similar reference, you might be thinking of: 116534
The model number often refers to a specific aftermarket replacement link for modern Rolex Datejust watch bands. However, the same number is also used as a reference for several other distinct items. Common Uses for "116534" An Outboard Marine Corporation (OMC) pinion and bearing