Watch's strap attach-point issue ("reversing bevel")

I am just practicing modelling 3D objects in Blender, but I am not sure what to do.

Context

The inside bevel (strap attachment-point) should have hard edges and pushed back.

image

Issue

I am stuck on what to do in order to make it appear as that.
Extrusion, moving, size, bevelling (inwards; not a feature),


— Result of attempt (selecting all lines and dissolving.


I have not 3D modelled before, so I can’t figure this one out.