Seiko Cal. 5640 - 310

The Seiko 5640-310 represents an important milestone in Seiko's 1998 lineup. The Coin-Edge bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-d3d67800651f]

Also known as: Golden Tuna, Baby Tuna

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1998

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