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Movement tier: unclassified · caliber Seiko Cal. 9R65 -- Spring Drive automatic, 28,800bph glide spring, 72h PR, 30j; patented tri-synchro regulator; Japan-only movement standard
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
40.5 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.
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The Spring Drive glide spring seconds motion is the definitive authentication; any stepping or sweeping seconds is not a Spring Drive.
Known issues in the market
Standard automatic movements with high-beat sweeping seconds are occasionally misrepresented as Spring Drive; only the glide spring produces truly continuous seconds.
The glide spring motion is distinctive under magnification; a near-sweep from a standard 28,800bph movement is not the same.
Area
What to check
What is correct
Red flag
movement
Seconds hand motion under magnification
Perfectly smooth continuous arc with zero stepping or near-stepping; the Spring Drive glide spring signature
Any stepping or near-stepping seconds hand; not a Spring Drive movement
caseback
Cal. 9R65 identification
Cal. 9R65 rotor and Spring Drive engraving visible through caseback
Standard automatic rotor without Spring Drive labeling; movement swap
Common legitimate replacements
Standard automatic movements are occasionally swapped into Spring Drive cases; the seconds motion is the immediate tell.
Seiko Spring Drive official documentation. WatchUSeek Spring Drive subforum for Cal. 9R65 identification.
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