Seiko Cal. 5688 - 525

The Seiko 5688-525 represents an important milestone in Seiko's 1970 lineup. It features a Black dial protected by a Sapphire crystal and offers 80m of water resistance. [seikata-wm-aa287fb2e314]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Black

Jewels

19j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1970

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