Seiko Blue Ocean (SBBN021)

Item Number: SBBN021 
Movement: Quartz 
Water resistance: 1000m waterproof for saturation diving 
Battery life: 5 years 
Accuracy: between ± 15 seconds per month 
One-piece case 
Seiko Limited 130th anniversary commemorative model 
Production: 400 (300 domestic) 
Back stamped with “LIMITED EDITION” and serial number 
Locking screw bezel crown / unidirectional rotating Anti-magnetic 
Lens: Sapphire glass 
Case Material: Pure titanium (hard coating) outside the body protector + Blue ceramics
Case Size: 48 × 48mm 
Case Thickness: 15.4mm 
Band Material: Polyurethane 
Band Width: 22mm Weight: 114g 

Seiko Spirit (SCVS001 vs SCVS003)

6R15 的機芯有 3 種, 6R15A、6R15B 同 6R15C

Late 2005 – 6R15A introduced, based on the 7S with Etachron regulator and Spron 510 mainspring. 

Late 2006 – 6R15B introduced – new parts: 
- the barrel and train wheel bridge 
- the movement barrel (complete) 
- the centre wheel and pinion 
- the ratchet wheel the oscillating weight
- the ratchet wheel screw 

Late 2011 – 6R15C introduced – changes: 
- modified ratchet sliding spring
- modified date indicator maintenance plate 
- new balance wheel 
- new barrel 

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