Seiko Presage SPB309J1 Sharp Edged Midday Open Heart Silver SPB309

Movement
Caliber Number
6R38
Movement Type
Automatic with manual winding
Precision
+25 to -15 seconds per day
Power reserve
Approx. 70 hours
Jewels
24
Functions
Stop seconds hand function
Case/Band
Case Material
Stainless steel (super hard coating)
Case Size
Thickness:11.8mm
Diameter:40.2mm
Lug-to-lug:47.4mm
Crystal
Sapphire crystal
Crystal Coating
Anti-reflective coating on inner surface
LumiBrite
Lumibrite on hands and index(es)
Clasp
Three-fold clasp with push button release
Distance between lugs
20
Other Details
Water Resistance
10 bar
Weight
161.0
Features
See-through case back
Screw case back
See-through & Screw case back