Seiko Prospex SPB383 Sea MM200 Automatic GMT Black

Caliber Number
6R54
Movement Type
Automatic with manual winding
Precision
+25 to -15 seconds per day
Power reserve
Approx. 72 hours(3 days)
Jewels
24
Functions
24-hour hand
Stop second hand function

Case/Band

Case Material
Stainless steel (super hard coating)
Case Size
Thickness:12.9mm
Diameter:42.0mm
Lug-to-lug:48.6mm
Crystal
Sapphire crystal
Crystal Coating
Anti-reflective coating on inner surface
LumiBrite
LumiBrite on hands, index(es) and bezel
Clasp
Three-fold clasp with secure lock , push button release with extender
Distance between lugs
20mm

Other Details

Water Resistance
200m / 660ft diver's
Magnetic Resistance
4,800 A/m
Features
Unidirectional rotating bezel
Screw-down crown
Three-fold clasp with secure lock
Screw case back