Seiko Cal. 6637 - 845

The 6637-845 is a sought-after Spring Drive piece from Seiko's golden era. The Bidirectional bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-499a60da5aec]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

13.0mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Navy

Jewels

32j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1998

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