All Stainless steel case, with integrated bracelet. Bracelet has two parts; a banded steel mesh on either side of the watch case, and an scissor-type expansion portion connecting them at the back. The bracelet ends fit into a cutout in the case, and is sandwhiched between the front bezel and the caseback. Caseback is screw-on.
In reply to Problem is, it doesn't have a by AbslomRob
In reply to I'm fairly confident it's a by FifthAvenueRes…
The case has a raised edge with a ledge on the inside of it; the inner reflector/chapter ring sits on that. There's a pin you can see at 12 on the case that lines up with a notch on the ring to orient it. The crystal is actually seperate from the bezel, and fits over the raised edge. The bezel goes over the crystal, and compresses it against the edge to form the waterproof seal. The friction between the bezel, crystal and inner edge is what keeps the front on the watch.
I can see how one might construct a rotating bezel to work with the base case design, but it would involve a specifically machined "bottom" bezel to hold the crystal in place with the rotating bezel on top of it. Not sure if this is how the Oceanographer does it or not, but either way, this specific watch doesn't (and couldn't) have a rotating bezel.