Seiko Cal. 5640 - 434

The Seiko 5640-434 represents an important milestone in Seiko's 1968 lineup. The Coin-Edge bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-ec5679d06880]

Also known as: Bullhead, Goldfeather

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

10.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1968

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