SEIKO PROSPEX ALPINIST SPB123J1

The Seiko Prospex Alpinist SPB123J1 is an automatic field watch known for its classic style and durability. It is characterized by a cream or "champagne" dial, a green calfskin leather strap, and an internal rotating compass bezel. 

Technical specifications

• Case details:
  • Case material: Stainless steel
  • Case diameter: 39.5mm
  • Case thickness: 13.2mm
  • Lug-to-lug: 46.4mm
  • Lug width: 20mm
  • Case back: See-through screw-down case back
  • Crowns: Screw-down crown for time and date, plus an additional crown for the internal compass
• Movement details:
  • Calibre: 6R35
  • Type: Automatic with manual winding capability
  • Power reserve: Approximately 70 hours
  • Accuracy: +25 to -15 seconds per day
  • Jewels: 24 jewels
  • Features: Stop second hand function
• Crystal and dial details:
  • Crystal: Sapphire crystal with a magnified date window (cyclops) and anti-reflective coating on the inner surface.
  • Dial color: Cream/champagne with a sunburst effect
  • Hands and markers: Luminous hands and indices treated with Lumibrite for improved visibility.
  • Internal bezel: Rotating compass inner ring operated by the crown at 4 o'clock.
• Other features:
  • Water resistance: 20 bar (200 meters)
  • Strap: Green calfskin leather with a three-fold clasp and push-button release
  • Magnetic resistance: 4,800 A/m