I recently picked up a vintage Seamaster 300 that needed some help. The case was kind of bunged up, the crown was incorrect, it had a non-Omega crystal, and the dial lume had the look of algae:
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The good news: it ran well, had a nice bezel, and came with what I believe was the original 1039/516 bracelet. I decided to leave the case as found. I sourced a correct crown and crystal, then sent the dial off to James Hyman for a relume. It all came together nicely, I think, and serves me well as a great tool watch:
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