Seiko Cal. 6397 - 231

The Seiko 6397-231 represents an important milestone in Seiko's 1987 lineup. With its 20mm lug width and 11.5mm profile, it sits comfortably on most wrists. [seikata-wm-a5932475a5f9]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

80m

Dial Color

Cream

Jewels

29j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1987

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