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First off, there is no need to remove the bezel to authenticate the watch per se, but aftermarket GMT bezel rings do have coarser machining in the teeth that engage the click spring. And you can only see them by looking at the underside of the bezel.
Aside from that, authentication is done by a close examination of the movement. Obvious "tells" are the finish and balance, as the clone movements do not contain a free sprung balance. But it is possible to install a genuine balance into a clone movement, along with other genuine parts and create a very convincing "franken" that's hard to detect. If you have no box and papers, a teardown of the movement by someone who knows how to identify clone from genuine parts is your only option.
There are also aftermarket cases, casebacks, and bracelets made. It's a minefield out there.
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