Seiko Cal. 5640 - 465

The Seiko 5640-465 represents an important milestone in Seiko's 1968 lineup. With its 21mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-8071928e263a]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

13.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

190m

Dial Color

Cream

Jewels

29j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1968

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