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What going on with the black discoloration in the center of this Speedmaster case back?

  1. DG GW Mar 21, 2018

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    What going on with the black discoloration in the center of this Speedmaster case back? Is this unusual? How would this have happened? Speedmaster black dot.jpg
     
  2. eugeneandresson 'I used a hammer, a chisel, and my fingers' Mar 21, 2018

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    Sticker residue. Most likely was never removed.
     
    Temprus, efauser and Davidt like this.
  3. Foo2rama Keeps his worms in a ball instead of a can. Mar 21, 2018

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    Blue rubbery gunk used to protect new watches from the factory.

    Normal
     
  4. Kwijibo Mar 21, 2018

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    + you can take it off rubbing it (not with a steel thing)