Spring Drive Tourbillon
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Authentication
The Credor Spring Drive Tourbillon combines Spring Drive tri-synchro regulation with a flying tourbillon in a platinum case. Production is extremely limited and the watch is primarily known in Japan. The same authentication logic as the Eichi II applies: misrepresentation rather than counterfeiting is the risk.
- Both the glide seconds hand and the tourbillon rotation should be observed; the glide motion is the Spring Drive tell and should be present regardless of the tourbillon.
- Platinum case should carry correct Japanese and international precious metal marks; platinum weight is significantly heavier than white gold of the same dimensions.
- Production is so limited that any example should have documented provenance and ideally a Seiko/Credor service record.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Spring Drive glide seconds combined with tourbillon rotation | Tourbillon rotates once per minute with smooth, consistent motion; seconds display shows glide motion; both mechanical systems should be operational simultaneously | Either the tourbillon stopped or the seconds display showing tick motion; tourbillon cage rotation other than one per minute |
| case | Platinum case weight and hallmarks | Platinum is approximately 40% heavier than white gold for the same dimensions; correct precious metal marks (Pt950 or equivalent) present on case; case weight consistent with declared material | Case weight lighter than expected for platinum; missing or incorrect metal marks; case feels like white gold rather than platinum |
| dial | Tourbillon aperture and dial finishing | Tourbillon aperture has clean, polished edges; any dial decoration meets Credor standards with the same depth and quality as the Eichi II | Rough aperture edges; dial decoration quality inconsistent with Credor standards |
| movement | Zaratsu-polished movement visible surfaces | Movement surfaces visible through the caseback show mirror-flat Zaratsu polish; no micro-scratches on polished zones | Micro-scratches or orange-peel texture on what should be Zaratsu-polished surfaces |
- No standard replacement parts available outside the Seiko factory service network.
Authentication guide
Cal. 7R08 in a platinum case. The Spring Drive glide spring is the definitive authentication test: a genuine Spring Drive runs silently with a continuous sweep. Any audible tick is disqualifying.
