Seiko Prospex SPB509 1968 Heritage 60th Anniversary GMT Limited Edition

Movement
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 (dual time display function)
Stop second hand function
Case/Band
Case Material
Stainless steel (Bezel: Stainless steel with ceramic display)
Case Size
Thickness:13.3mm
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, solid & slide adjuster
Distance between lugs
20
Other Details
Water Resistance
300m / 1000ft diver's
Magnetic Resistance
4,800 A/m
Features
LIMITED EDITION on the case back
Serial number engraved on the case back
Unidirectional rotating bezel
Screw-down crown
Three-fold clasp with secure lock
Screw case back