Seiko Cal. 6637 - 655

The Seiko 6637-655 represents an important milestone in Seiko's 1990 lineup. With its 22mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-3053387a0898]

Also known as: Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

9.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Navy

Jewels

35j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1990

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