Seiko SSB447 Chronograph

A bold, all-black chronograph crafted in stainless steel with a sapphire crystal, designed for precision, style, and everyday durability.

Key Features

• Quartz movement (Caliber 8T63) with ±15 seconds/month accuracy

• Chronograph up to 60 minutes in 1/5-second increments

• 24-hour hand & small seconds sub-dial

• Date display

• Tachymeter scale for timing speed and distance

• 100m water resistance (10 bar)

• Sapphire crystal for scratch resistance

• LumiBrite on hands and indexes for low-light visibility

Case & Build

• Case Material: Stainless steel

• Case Diameter: 43.0 mm

• Thickness: 11.6 mm

• Lug-to-Lug: 50.4 mm

• Weight: 159 g (solid feel with stainless build)

• Lug Width: 22 mm

• Screw case back

• Three-fold clasp with push-button release

Dial & Visibility

• Dial Color: Black

• Sapphire crystal for enhanced durability and clarity

• Tachymeter bezel integrated for sporty function

• LumiBrite-treated hands and indexes for excellent readability in dark settings

Durability

• Water Resistance: 100m (swimming, snorkeling — not suitable for diving)

• Magnetic Resistance: 4,800 A/m

• Strong sapphire crystal resists scratches

• Solid stainless steel bracelet ensures a long-lasting, premium feel