Corrosion under the dial

I guys, how’s going on?

Im writing because i was servicing an old timex and it had a bit of corrosion under the dial (i feel humidity made that corrosion)

So i scratched the blue/green corrosion with my tweezers but im worried about how it can develop over the time.

Do you feel its safe to leave as is? Or better to apply something? Maybe nail polish?

Happy to hear your thoughts

Corrosion under the dial

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Usable mainspring?

Hi guys, someone know if that mainspring is still usable?

I serviced an old poljot and when i dissassembled the mainspring i feel i assembled wrong. So now it have this shape.

First it was ok (when i dissassembled it). Can i still use this one?

Its …

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