Seiko Cal. 0740 - 639

The Seiko 0740-639 represents an important milestone in Seiko's 1981 lineup. It features a White dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-3beecde24cb2]

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

90m

Dial Color

White

Jewels

32j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1981

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