Dust proof?

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I presume that a watch that is waterproofed to 300m shouldn't theoretically let dust in either?
 
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Correct 馃榾 If there is dust then either the seals are compromised so it's no longer water resistant or it has always been there from the factory or last intervention/service.
 
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I presume that a watch that is waterproofed to 300m shouldn't theoretically let dust in either?

Not theoretically at all, if the watch is waterproofed to 300m it will absolutely not let dust in.
 
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But tiny specs of dust can appear during manufacturing or from the lume application breaking apart over time. Happened on my AT recently. Tiny dust appeared on the dial, they weren't there before this, which they assumed were from the lume. Thankfully the watch was still under warranty and they removed the dust particles at no charge.