Seiko Cal. 5688 - 728

This Spring Drive model from 1971 features a 40mm Two-Tone case. It features a Navy dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-0ca2ff168d01]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

10.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Navy

Jewels

19j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1971

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