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I got my Sumo back from the watch maker for a service because it was running slow by 120 seconds a day and during collection. I've noticed a large speck of dust sticking on the crystal underneath. The watch maker immediately opened up again and clear up the speck of dust. Then I check and the dial seems clean. Got it home and started wearing it. While under the sun, I've noticed a tiny white spec of dust on the edge of the dial extremely close to the chapter ring. It only appears when…
