Seiko Cal. 6637 - 776

Released in 1976, the Cal. 6637 with design code 776 was part of Seiko's domestic market collection. It features a Black dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-25bbcd0fc4f7]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

30m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1976

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