Seiko Cal. 6637 - 501

The Seiko 6637-501 represents an important milestone in Seiko's 1983 lineup. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-a977e4fffa0e]

Also known as: Panda, Baby Tuna

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

40mm

Case Thickness

9.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Burgundy

Jewels

27j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1983

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