Seiko Cal. 6637 - 616

The Seiko 6637-616 represents an important milestone in Seiko's 1970 lineup. It features a Green dial protected by a Sapphire crystal and offers 180m of water resistance. [seikata-wm-3a760257c301]

Also known as: Sportsmatic, Flighty

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Green

Jewels

29j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1970

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