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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.
This just arrived. I'm really not sure though. It weighs a ton and is very shiny and cheap looking.