Seiko Prospex Alpinist SPB505J1 "Summit Black" Automatic Watch

Case Material: Stainless steel (super hard coating)
Case Size: Thickness:12.7mm
Diameter:39.5mm
Lug-to-lug:46.4mm
Crystal: Sapphire crystal with magnifier
Crystal Coating: Anti-reflective coating on inner surface
LumiBrite on hands and index(es)
Clasp: Three-fold clasp with push button release
Distance between lugs: 20
Caliber Number: 6R55
Movement Type: Automatic with manual winding
Precision
+25 to -15 seconds per day
Power reserve: Approx. 72 hours(3 days)
Jewels: 24
Functions: Stop second hand function
Water Resistance: 20 bar
Magnetic Resistance: 4,800 A/m
Weight: 147.0
Features: Rotating compass bezel
Screw-down crown
See-through & Screw case back