Seiko Cal. 5618 - 391

This Spring Drive model from 1986 features a 40mm Stainless Steel case. With its 19mm lug width and 9.7mm profile, it sits comfortably on most wrists. [seikata-wm-fc3539a0d825]

Also known as: Sea Horse, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

9.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Silver

Jewels

26j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1986

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