Seiko Cal. 6687 - 590

The Seiko 6687-590 represents an important milestone in Seiko's 1977 lineup. With its 20mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-0e9ca9cae634]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

15.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Burgundy

Jewels

17j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1977

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