Seiko Cal. 6640 - 881

This Solar model from 1967 features a 44mm Titanium case. It features a Black dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-afcf3df2a161]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Titanium

Case Width

44mm

Case Thickness

11.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Black

Jewels

33j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1967

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