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Yeah funny you say that as I made the same comment on another forum yesterday as a gent was saying he's not fused on the whole matte and textured dials as of late e.g. BB58 and so on. I said the same thing regarding legibility and that you find the finish on many military watches for the same reason to strip it down to the core essentials, minamise reflection / glare to get the job done e.g. proper tool watch.
Was confused because the grey looks more sunburst but the blue looks more subdued.
D-Dog-
I haven't seen the 6RMAS ones IRL to compare but it's possible that the grey dial one is more of a direct imitation of the glossier 62MAS dial. The SLA017 dial is not matte.
(Edit: put the 017 on today and it actually does have a matte finish to the sunburst. Just much less noticeable due to the effect of the domed glass and polished rehaut.)
Regal
Many recent Seiko divers with sunburst dials have a kind of satin top layer finish to the dial surface. I suspect it’s a legibility thing, to avoid excessive glare - Seiko tends to do things like this on their “proper” divers watches. Eg they don’t tend to use applied markers or logos even on quite expensive models, supposedly to avoid the risk of dial furniture coming loose if the watch takes a knock.
Most of the time you don’t notice the matte finish, but sometimes when the light catches it it’s very obvious.