Seiko Cal. 5640 - 345

The Seiko 5640-345 represents an important milestone in Seiko's 1971 lineup. With its 21mm lug width and 15.0mm profile, it sits comfortably on most wrists. [seikata-wm-769bd8a1bf9a]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

46mm

Case Thickness

15.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

30m

Dial Color

Navy

Jewels

33j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1971

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