Seiko Cal. 5640 - 783

The Seiko 5640-783 represents an important milestone in Seiko's 1967 lineup. It features a Champagne dial protected by a Acrylic crystal and offers 190m of water resistance. [seikata-wm-4988f65f1e35]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

190m

Dial Color

Champagne

Jewels

21j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1967

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