Seiko Cal. 6656 - 337

The Seiko 6656-337 represents an important milestone in Seiko's 1976 lineup. With its 18mm lug width and 11.0mm profile, it sits comfortably on most wrists. [seikata-wm-d63cd017de2f]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Black

Jewels

30j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1976

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