Seiko Cal. 6637 - 120

The Seiko 6637-120 represents an important milestone in Seiko's 1986 lineup. Powered by the 6637 caliber with 25j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-bc49e2f82eca]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1986

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