Seiko Cal. 5688 - 557

The Seiko 5688-557 represents an important milestone in Seiko's 1968 lineup. It features a Silver dial protected by a Hardlex crystal and offers 150m of water resistance. [seikata-wm-c0da5cad4c87]

Also known as: Samurai, Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

15.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Silver

Jewels

36j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1968

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