Seiko Cal. 5642 - 644

The Seiko 5642-644 represents an important milestone in Seiko's 1975 lineup. Powered by the 5642 caliber with 17j jewels beating at 28,800 bph, it delivers a 70 hours power reserve. [seikata-wm-697ae1577c1c]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

60m

Dial Color

Champagne

Jewels

17j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1975

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