Seiko Cal. 5617 - 641

The Seiko 5617-641 represents an important milestone in Seiko's 1970 lineup. Powered by the 5617 caliber with 27j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-60da1bfbc517]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

36mm

Case Thickness

8.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Black

Jewels

27j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1970

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