Bezel question

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Hi, what’s the difference between these 2 bezels? The size seems the same but they have a different back.

Any help is appreciated.

 
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How many clicks each provide. Are they both genuine Omega?
 
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How many clicks each provide. Are they both genuine Omega?
Hi, they are genuine. I got them from a watchmaker who was selling them. Not sure how to check for clicks.
 
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Hi, they are genuine. I got them from a watchmaker who was selling them. Not sure how to check for clicks.If counting the threads in the back one has 100 and the other has 60.
 
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I'm certainly no expert on bezels but I believe the Seamaster comes with a 120-click bezel; the three of mine nearby do. The GMTs might have 60-clicks, though, but both of your bezels have diver's inserts. Some chronographs might have 60-click bezels. My chronograph is in my safe, maybe I'll check later. It's of note, however, that genuine Omega bezel inserts seperate from the bezel aren't available from Omega at all.