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In-house manufacture caliber
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
41 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.
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Authentication
Zenith star motif in the skeletonized bridges is structural in genuine examples and decorative only in fakes.
Known issues in the market
- The star motif is load-bearing in the original Elite 670 SK; purely decorative in counterfeits.
- Open-worked bridges must visually integrate case and movement architecture.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Star motif in skeletonized bridges | Zenith star motif present in skeletonized bridges as structural element; visible through dial and from caseback | Star motif absent; generic openwork pattern without star; star present as applied ornament rather than structural cutout |
| dial | Skeleton dial integration | Dial and movement visually integrated; movement architecture readable through open sections | Solid dial sections blocking movement view; non-skeleton movement installed in skeleton case |
| caseback | Cal. Elite 670 SK identity | Cal. Elite 670 SK designation; skeleton rotor; Zenith in-house architecture | Non-Zenith caliber; solid-plate movement in skeleton case; incorrect caliber engraving |
Common legitimate replacements
- Original Defy Classic rubber or leather strap; factory options through Zenith.
Expert resources: Zenith Defy Classic 10.9000.670 press materials. Zenith Cal. Elite 670 SK documentation.
Authentication guide
Last reviewed June 2026
The Defy Classic uses the skeletonized Elite 670 SK caliber in the octagonal Defy case. The open-worked movement is the primary visual statement. Authentication focuses on movement finishing quality and the octagonal case geometry.
Sources: Zenith -- Defy Classic and Elite 670 SK specification; WatchUSeek -- Zenith Defy forum.






