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  1. 6139-8050 scratched crystal - polishing, or replace?

    WATCHMAKING & TINKERING
    I picked up a 1976 6139-8050 chronograph recently at a pretty fair price. The dial looks beautiful, but the crystal is covered in surface scratches. It's a pretty tough to find/expensive crystal I think (310W24GN), and I don't have tools or experience replacing a crystal either. If this is the...
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