Seiko 5 Sports x Mechanical ft. Military Fieldwatch Men Casual Formal Round 100m Water Resistant Watch SRPH31K1 SRPH31 SRPH-31 SRPH-31K1

Caliber Number / Movement
4R36 (automatic with manual winding capacity)

Power Reserve / Accuracy
Approximately 41 hours ( 45 to -35 seconds per day)

Crystal
Hardlex crystal (curved)

LumiBrite
Lumibrite on hands and indexes

Case & Band Material
Stainless steel case with nylon band

Water Resistance
100m / 10 bar

Case Size
Thickness: 13.2 mm
Diameter: 39.4 mm
Length: 48.1 mm

Other Specifications
Seiko 5 Sports x Mechanical ft. Military Fieldwatch
See-through back case
Screw case back
24 jewels
Day and date display
Stop second hand function (hacking mechanism)
Regular timekeeping (analog display)