Rolex 1680 case with weird bezel

[oysterquartz17000]

Hi - I picked up a Rolex submariner 1680 recently. It came with a bezel and insert. The bezel looks unusual to me, the groves around the bezel edge look pointed and come very close to the inserts outer edge. They usually have a scalloped shape to them. This could be heavy wear, I'm not sure. What are your thoughts?

Also the bezel is pretty easy to take off by hand, a small twist at either end and it pops off.

If this is not off a Rolex, could it be off this Tudor I have pictured below, they look very similar.