Seiko Cal. 5640 - 456

This Spring Drive model from 1982 features a 36mm Two-Tone case. With its 19mm lug width and 14.8mm profile, it sits comfortably on most wrists. [seikata-wm-b0ee70de8706]

Also known as: Tuna, Panda

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

14.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1982

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