If be surprised to see any type of substantial update. In my mind, the MM300 occupies a very specific spot in the Seiko lineup. If you want to go deeper, cheaper, more exclusive, screw in case back, similarly priced but different design....whatever, there are other models Seiko offers. As for the MM300, it's appeal IMHO, is mostly a brand lineage thing and, as such, it is what it is.
I agree with jacks earlier points on how it could be improved, but then it would be a different watch entirely. Make a new diver? Sure. Fundamentally change this one? Don't see it happening.
I love mine as it is, for what it is, with all it's strengths and faults. Going to switch over to it now in fact
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