Seiko Cal. 5640 - 883

This Quartz model from 1976 features a 36mm Hardlex-Coated Steel case. It features a Cream dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-3255c19179f0]

Also known as: Tuna, UFO

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Cream

Jewels

18j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1976

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