It's one of the easiest ways to distinguish an old DON with the new, and if the new DON bezels can swap over to previous Speedies, The old DON bezels had the dot in between the 300 and the 275, where the dot hovered over the 2 in the 275. Newer dot next-to-90 bezels changed this, and the dot is closer to the 300, even seen in the newer DON bezels.
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