Seamaster 300 bezel Insert question

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The before / after even if it doesn’t help, still impressed by the result..

That is a excellent job, who did that ?
From what I have been told by a watchmaker that has experimented with this process and had some success , it is fraught with the risk of wrecking the bezel.
 
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The before / after even if it doesn’t help, still impressed by the result..