Seiko Cal. 6637 - 437

The 6637-437 is a sought-after Spring Drive piece from Seiko's golden era. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-94e761c2c647]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

70m

Dial Color

White

Jewels

29j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1981

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