Seiko Cal. 6639 - 937

The Seiko 6639-937 represents an important milestone in Seiko's 1981 lineup. It features a White dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-030b28236b57]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

9.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

150m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1981

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