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·I recently acquired this 1971 145.022. The watch arrived in beautiful condition with one exception: there was a deep scratch, almost like a little crater, in the crystal over the 60 minute subdial. I really didn’t want to replace the crystal because it’s the signed original, but I wasn’t sure that any amount of polishing would remove the scratch. Well, after 15 minutes of working the surface with PolyWatch, it’s like I have a new crystal again. This stuff really works. Try that with sapphire, especially AR coated sapphire.
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