Seiko Cal. 5688 - 711

The Seiko 5688-711 represents an important milestone in Seiko's 1966 lineup. It features a White dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-90ff62e89ee7]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1966

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