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Entry-tier movement · caliber NH35A base (Seiko/TMI) -- automatic, 21,600bph, 41h PR, 24j; Asaoka-regulated
Versatile size: fits most wrists (6–7.5 in / 15–19 cm)
38 mm case. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.
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Niji rainbow-dial piece: enamel coloring is the primary authenticity indicator; verify against Kurono production images.
Known issues in the market
Rainbow dials are appealing to casual buyers who may not verify serial numbers.
Area
What to check
What is correct
Red flag
dial
Rainbow gradient accuracy
Gradient matches Kurono Niji production images; transitions are smooth and consistent
Gradient that differs from official images, color that appears printed rather than enameled, any surface texture inconsistency
caseback
Niji designation and serial
Niji reference on caseback, serial verifiable with Kurono
Wrong variant designation, unverifiable serial
Common legitimate replacements
Strap replacements common.
Expert resources: Kurono Tokyo serial verification is the definitive step.
Authentication guide
Last reviewed June 2026
The Niji features a rainbow-spectrum dial achieved through hand lacquering in multiple color transitions. The color gradient is the defining authentication point.
Known reproduction risks
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MEDIUM
Printed gradient dial on NH35 or generic movement
Gradient appears printed or photographic, lacking lacquer depth
Color transitions are uniform across all examples rather than piece-specific
Surface is flat under magnification
Because each Niji varies slightly, a seller claiming two identical dials should raise a question.
Dial variants by era
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Era
Description
Identifiers
Niji release
Multi-color lacquer dial transitioning through the visible spectrum from 12 o'clock around the dial. Each piece varies slightly in color saturation and transition point.
