Seiko Cal. 6645 - 728

The Seiko 6645-728 represents an important milestone in Seiko's 1981 lineup. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-a4e39965b2e9]

Also known as: UFO, Arnie

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Cream

Jewels

29j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1981

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