‘Driven’ back

[Murphtimes]

You're correct that a "driven" back typically refers to a press-fit case back. In this design, the back is secured tightly against the case without threads, which can make it less robust than a screw-down case back but still provides adequate water resistance for most Panerai models.

The mention of a "bayonet fitting" may refer to a specific type of press-fit that involves a locking mechanism, but it’s often used interchangeably with press-fit in this context. If you're considering a watch with a driven back, it's always a good idea to check the specific model's water resistance rating to ensure it meets your needs.