Seiko Cal. 5640 - 754

This Spring Drive model from 1985 features a 34mm Hardlex-Coated Steel case. With its 19mm lug width and 15.4mm profile, it sits comfortably on most wrists. [seikata-wm-0728c3fd30ca]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

15.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Green

Jewels

31j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1985

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