Seiko Men's Core Chronograph line

• Model: SSB399P1
• Brand: Seiko
• Collection: Conceptual / Neo Sports / CS Sports / Core Chronograph line
• Gender: Men’s watch (unisex‑friendly)

• Case Material: Stainless steel 316L with black PVD coating (black tone case)
• Case Shape: Round, sport chronograph profile with tachymeter style bezel and crown guards
• Case Finish: Brushed and polished black PVD
• Case Colour: Black / dark grey tone PVD
• Case Diameter: 40–41 mm (case excluding crown)
• Case Thickness: 12.0–12.3 mm
• Lug to lug Distance: 46–48 mm
• Crystal: Hardlex mineral glass (domed, scratch resistant)
• Case Back: Screw down stainless steel caseback
• Dial Colour: Black, with grey brown or textured sunburst / racing pattern accents
• Dial Type: Analog 3 hand with small seconds, 24 hour sub dial, 60 minute chronograph counter, and date window
• Indices: Luminous (LumiBrite) bar style or square indices with contrast against black dial
• Hands: Silver or dark tone hour and minute hands with luminous fill; contrasting central seconds hand (often orange or red accented on some variants)
• Luminescent Elements: Luminous hands and indices for strong low light legibility
• Strap/Bracelet Material: Stainless steel multi link bracelet with black PVD coating
• Strap/Bracelet Colour: Black / black tone steel
• Strap/Bracelet Width at Case: 20–22 mm (lugs)
• Strap/Bracelet Width at Buckle: 20 mm
• Buckle Type: Three fold push button deployment clasp (safety folding)

• Movement Type: Quartz chronograph (Caliber 8T63)
• Power Source: 3V silver oxide battery (SR936W or similar)
• Battery Life: Approx. 3 years under normal use
• Precision: ±15 seconds per month
• Display Type: Analog 3 hand with small seconds, 24 hour sub dial, 60 minute chronograph counter, and date window
• Functions:
• 3 hand time (hours, minutes, small seconds)
• 24 hour hand (GMT style display)
• Chronograph with 1/5 second increments up to 60 minutes
• Date display (day of month at 3 o’clock)
• Tachymeter styled bezel scale

• Case Diameter: 40–41 mm
• Case Thickness: 12.0–12.3 mm
• Lug to lug Distance: 46–48 mm
• Strap/Bracelet Width at Case: 20–22 mm
• Strap/Bracelet Width at Buckle: 20 mm
• Wrist Range: Approx. 165–210 mm (standard deployment)
• Weight: Approx. 150–152 g
• Color Configuration:
• Case Colour: Black PVD stainless steel
• Dial Colour: Black with grey brown racing pattern
• Hands Colour: Silver or dark tone with luminous tips; contrasting seconds hand
• Strap/Bracelet Colour: Black PVD steel

• Water Resistance: 10 bar (100 m), ISO 2281 compatible swim suitable
• Case & Crystal: Stainless steel case with PVD coated black surface and Hardlex mineral crystal
• Movement: Quartz chronograph (Cal. 8T63) with 1/5 second chrono up to 60 minutes, 24 hour hand, and date window
• Warranty: Typically 2–3 years depending on retailer (often 1+1 or 1+2 formats)
• Packaging: Seiko box plus warranty card and documentation