Seiko Cal. 6657 - 309

The Seiko 6657-309 represents an important milestone in Seiko's 1977 lineup. With its 22mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-f99133409aa2]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

15.7mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Silver

Jewels

26j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1977

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