Seamaster Diver 300 bezel nick

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It happens, and in time, it won’t matter. It is just signs of a life on the wrist.
 
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As mentioned by others, this watch is already not in mint condition.

When did you get the nick? I suggest waiting a few weeks before deciding whether you absolutely need to fix it. The emotional damage is the worst in the first week but it will gradually fade. Time heals all wounds (but unfortunately, the nick will remain).