Original Pulsation Bezel

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Hello, after years of searching, I found my Ed White. Which has always been my ultimate Speedmaster, straight lugs, no guards, 321cal. It is also my first (and I believe the last) vintage Speedmaster. I am looking for this Pulsation Bezel, which I always liked. Please, does anyone have an idea where I could buy one? I want to find the original, not a later replacement. Thank you for any advice. Tomas