Seiko Prospex SSC939 – Speedtimer Solar Chronograph

The SSC939 delivers a bold, modern aesthetic with a charcoal dial, offering a more understated yet striking take on Seiko’s Speedtimer design. Built for everyday reliability, it combines solar-powered precision with classic motorsport-inspired functionality.

Key Features

• Caliber V192 – Solar-powered chronograph (charges with any light source)

• Accuracy: ±15 seconds per month

• Power Reserve: ~6 months when fully charged

• Functions:

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

  • Power reserve indicator

  • 24-hour hand

  • Small seconds sub-dial

  • Date display

  • Overcharge prevention function

• Water Resistance: 100m (10 bar)

• Tachymeter bezel for measuring speed

• 3-year warranty

Case & Build

• Case Material: Stainless steel

• Case Size: 41.4 mm diameter × 13.0 mm thickness

• Lug-to-lug: 45.9 mm

• Lug Width: 21 mm

• Case Back: Screw case back

• Weight: 164 g

Dial & Visibility

• Dial Color: Charcoal (dark grey) with contrasting chronograph sub-dials

• Crystal: Curved sapphire crystal

• Crystal Coating: Anti-reflective coating on inner surface

• LumiBrite on hands and indices for night visibility

Bracelet & Clasp

• Bracelet Material: Stainless steel

• Clasp: Three-fold clasp with push-button release

Durability

• Magnetic Resistance: 4,800 A/m

• Scratch-resistant sapphire crystal

• Rugged stainless steel construction for long-lasting use

⚡ In short: The Seiko Prospex SSC939 is a 41.4mm solar chronograph that blends durability with a sleek charcoal dial design. It’s powered by light, requires no battery changes, and offers full chronograph + tachymeter functionality—making it perfect for those who want everyday wearability with a bold, technical look.