Seiko Cal. 5640 - 771

This Spring Drive model from 1966 features a 39mm Gold-Plated case. With its 19mm lug width and 9.3mm profile, it sits comfortably on most wrists. [seikata-wm-14be806ccbbc]

Also known as: Tuna, Arnie

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

9.3mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1966

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