Seiko Cal. 6386 - 637

The Seiko 6386-637 represents an important milestone in Seiko's 1977 lineup. Powered by the 6386 caliber with 33j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-038b6d84aa68]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Silver

Jewels

33j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1977

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