The NH movement is a Seiko movement, but it is unbranded. It’s cheaper than the 4R movement, so it’s the go to choice for building/modding.
I’m all for modding Seiko but can the watches shown above even be considered “Seiko”? Those are fake fantasy dials/hands/bezels/cases created to resemble something else- usually Rolex. The only thing “Seiko” would be the NH movement inside.
My foray into Seiko modding stemmed from buy turtles and swapping the dials into genuine SKX cases with aftermarket bezels & chapter rings.
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And then this, which is a genuine dial but the case, hands, bezel are aftermarket
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That switched to finding genuine parts suppliers and buying OEM parts to build something I wished Seiko would have made. I got a hold of 3 Zimbe dials, 2 Dawn Grey, OEM Zimbe hands, 4R movements w/OEM Kanji day/date discs, and SKX cases. It can be quite fun and addicting. The only OEM bezel is the all black one below. All the other bezel inserts are aftermarket.
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