Seiko Cal. 5641 - 640

The Seiko 5641-640 represents an important milestone in Seiko's 1967 lineup. Powered by the 5641 caliber with 24j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-a82ad6e4bd36]

Also known as: Silverwave

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

8.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Champagne

Jewels

24j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1967

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