Seiko Cal. 6388 - 904

The Seiko 6388-904 represents an important milestone in Seiko's 1987 lineup. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-84c33ef589b6]

Also known as: Helmet, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

15.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1987

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