Seiko Cal. 6637 - 205

The Seiko 6637-205 represents an important milestone in Seiko's 1979 lineup. The Inner Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-fb11f3f5b915]

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

13.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Navy

Jewels

35j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1979

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