Seiko Cal. 5645 - 640

This Spring Drive model from 1984 features a 37mm PVD Black case. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-09a011f47194]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1984

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