Seiko S23633J1F Prospex Marine Master Professional 300M Quartz Scuba Diver Tuna

• Caliber: 7C46

• Type: Quartz movement with day/date display

• Accuracy: ±15 seconds per month

• Battery life: Approximately 5 years 

Design & Materials

• Case material: Stainless steel with super-hard coating

• Crystal: Sapphire crystal with anti-reflective inner coating

• Diameter: ~47.7 mm

• Thickness: ~14.1 mm

• Weight: ~200 g

• Lug‑to‑lug: ~46.7 mm; Lug width: 22 mm 

Water Resistance & Dive Features

• Water resistance: Rated to 300 m / 1000 ft—suitable for saturation diving

• Bezel: Unidirectional rotating bezel

• Caseback: Screw‑in case back

• LumiBrite: Applied to hands and hour markers for visibility in low light 

Bracelet & Clasp

• Bracelet: Stainless steel with secure three‑fold clasp, push‑button release, plus slide adjuster
  (Note: another variant “S23631J1” uses a silicone strap; S23633J1 is the stainless‑steel‑band version) 

Additional Details

• Jewels: 7

• Country of manufacture: Japan

• Warranty: Typically 3 years international (e.g. starting July 2024) depending on region