Seiko Cal. 6637 - 918

The Seiko 6637-918 represents an important milestone in Seiko's 1967 lineup. It features a Burgundy dial protected by a Sapphire crystal and offers 170m of water resistance. [seikata-wm-475f87b24d69]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

43mm

Case Thickness

14.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Burgundy

Jewels

23j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1967

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