Seiko Cal. 5640 - 540

The Seiko 5640-540 represents an important milestone in Seiko's 1978 lineup. The Inner Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-08d41cc91918]

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

40mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1978

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