Seiko Cal. 6637 - 403

The Seiko 6637-403 represents an important milestone in Seiko's 1975 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-85947d73494d]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

13.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1975

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