Seiko Cal. 6156 - 639

The Seiko 6156-639 represents an important milestone in Seiko's 1978 lineup. Powered by the 6156 caliber with 33j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-20dadc9143bd]

Also known as: Sumo, Navigator

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

43mm

Case Thickness

12.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

60m

Dial Color

White

Jewels

33j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1978

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