Seiko Cal. 6637 - 555

The Seiko 6637-555 represents an important milestone in Seiko's 1986 lineup. With its 18mm lug width and 12.7mm profile, it sits comfortably on most wrists. [seikata-wm-4e5fe3eb78aa]

Also known as: Sportsmatic, Golden Tuna

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

12.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Burgundy

Jewels

18j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1986

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