Seiko Cal. 6640 - 892

The Seiko 6640-892 represents an important milestone in Seiko's 1980 lineup. It features a White dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-4add4c635feb]

Also known as: Rally, Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

10.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

White

Jewels

27j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1980

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