Custom Timepiece • Seiko Mod
Cocktail Open Heart
Seiko Presage Inspiration with Open-Heart Dial & Exhibition Case Back
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Comprehensive Watch Specifications
- Case Diameter: approx. 40.5 mm (excluding crown)
- Case Thickness: approx. 12–13 mm
- Lug-to-Lug Distance: approx. 47.5 mm
- Lug Width: 20 mm
- Case Material: 316L Solid Stainless Steel
- Case Finishing: High-polish mirror finish on bezel and case sides with brushed lug accents
- Bezel: Fixed smooth stainless steel bezel
- Crown: Push-pull fluted stainless steel crown
- Weight: approx. 60–70 g (watch head only), ~90 g with strap & clasp
- Dial Type: White guilloché wave/sunburst textured cocktail dial
- Open-Heart Aperture: Skeleton balance wheel display window at 9 o'clock with polished metallic surround
- Indices: Faceted applied silver-toned dagger / arrow hour markers
- Hands: Dauphine-style polished silver-toned hour & minute hands; blued needle sweep seconds hand
- Dial Inscriptions: Applied "SEIKO" logo at 12 o'clock; printed "PRESAGE" and "AUTOMATIC" at 6 o'clock
- Chapter Ring: Finely printed minute and sub-second track
- Front Crystal: Premium scratch-resistant Sapphire Glass
- Caliber: Seiko Instruments (SII) NH39 Automatic Movement
- Movement Type: Mechanical automatic self-winding with manual hand-winding
- Jewels: 24 Jewels
- Beat Rate: 21,600 vibrations per hour (3 Hz)
- Power Reserve: approx. 41 hours
- Hacking Seconds: Yes (second hand stops when crown is pulled out for precise time synchronization)
- Shock System: Diashock shock absorber
- Case Back: Screw-down stainless steel with mineral/sapphire exhibition display window revealing the decorated rotor and balance wheel
- Factory Accuracy Rating: -20 to +40 seconds per day
- Strap Material: Genuine leather with embossed alligator/crocodile grain
- Color & Stitching: Warm caramel tan with reinforced off-white contrast perimeter stitching
- Lug Width / Buckle Width: 20 mm lug tapers to 18 mm at clasp
- Lining: Hypoallergenic, breathable soft tan leather inner lining stamped "GENUINE LEATHER 20"
- Strap Adjustment: Multiple adjustment sizing holes to fit wrist sizes from 6.25" to 8.25" (16 cm – 21 cm)
- Keepers: Fixed leather keeper ring and floating leather loop
- Clasp Mechanism: Double-folding butterfly deployant clasp
- Clasp Material: Solid 316L stainless steel with mirror polish
- Release Action: Dual side push-buttons for secure, one-touch release
- Strap Preservation: Deployant structure eliminates creasing and bending of leather strap
- Water Resistance: 10 Bar (100 meters / 330 feet) — splash, rain, and everyday water resistant
- Build Category: Hand-assembled bespoke custom timepiece (Seiko Mod based on Presage Cocktail aesthetic)