Seiko Cal. 5640 - 357

This Spring Drive model from 1973 features a 36mm Two-Tone case. With its 18mm lug width and 13.8mm profile, it sits comfortably on most wrists. [seikata-wm-c45a0ebc4a55]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

Burgundy

Jewels

26j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1973

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