Seiko Cal. 6637 - 770

The Seiko 6637-770 represents an important milestone in Seiko's 1966 lineup. With its 22mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-5cc79f355855]

Also known as: Shogun, Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

White

Jewels

27j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1966

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