Seiko Cal. 6637 - 558

The Seiko 6637-558 represents an important milestone in Seiko's 1968 lineup. Powered by the 6637 caliber with 23j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-7afd9e2b108b]

Also known as: Golden Tuna, Baby Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Champagne

Jewels

23j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1968

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