Seiko Cal. 6640 - 250

The Seiko 6640-250 represents an important milestone in Seiko's 1976 lineup. It features a Cream dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-dbc6464bbc85]

Also known as: UFO, World Timer

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

39mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

60m

Dial Color

Cream

Jewels

21j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1976

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