Help with 1675 Bezel

[grechuta]

A few days ago I received a 1675 root beer I bought from a dealer off the forums. Yesterday I was talking with my local watchmaker who specializes in vintage Rolex, and when he saw the bezel he said he felt it is off. He said the underside is different from every other 1675 bezel he'd seen and that it was enough to make him suspicious. The last picture below shows the bezel on the watch compared to another 1675 gold bezel he has in his store.

The seller I bought from has been very professional and has agreed to my returning it should I desire. I'm hoping to get some expert opinions on here regarding the authenticity of the bezel. Thanks very much.