Seiko Prospex SPB237 Willard 1970s Gray Dial Nato

Caliber Number
6R35

Movement Type
Automatic with manual winding

Accuracy
+25 to -15 seconds per day

Duration
Approx. 70 hours

Exterior
Case Material
Stainless steel (super hard coating)

Crystal
Curved sapphire crystal

Crystal Coating
Anti-reflective coating on inner surface

LumiBrite
Lumibrite on hands, indexes and bezel

Band Material
Polyester

Other Details
Water Resistance
200m / 660ft diver's

Case Size
Thickness: 13.2 ㎜
Diameter: 42.7 ㎜
Length: 46.6 ㎜

Weight
106.0 g

Other Specifications
Screw case back
Screw-down crown
Unidirectional rotating bezel

Other Features
24 jewels
Date display
Stop seconds hand function