Seiko Cal. 5640 - 764

The Seiko 5640-764 represents an important milestone in Seiko's 1997 lineup. The Inner Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-ab98f5f8dccc]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

12.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Silver

Jewels

29j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1997

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