Seiko Cal. 5640 - 899

The Seiko 5640-899 represents an important milestone in Seiko's 1984 lineup. With its 21mm lug width and 14.8mm profile, it sits comfortably on most wrists. [seikata-wm-fc93619ac591]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

14.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Silver

Jewels

20j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1984

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