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Miyota
Miyota's open-heart variant of the 9015 platform, featuring a skeletonized dial-side plate that exposes the balance wheel through a cutout in the dial. Shares the same reliable 28,800 vph architecture and 42-hour power reserve as the standard 9015. Popular among microbrands offering open-heart designs at accessible price points without resorting to Chinese movements.
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9 colorways
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Owners widely praise the Nordic Marine Instruments Østersøen for its excellent value and comfortable bracelet, with one owner noting the case catches the light nicely. The Miyota 90S5 movement offers very smooth manual winding, and the green dial's appearance shifts depending on the light. BGW9 lume and a clasp with micro-adjustment are also highlighted as positive features. One reviewer noted the crown's grip tread is excessive. Overall, owners rate the Nordic Marine Instruments Østersøen highly for its strong value proposition and comfortable wearability.
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