Seiko Cal. 6657 - 639

The Seiko 6657-639 represents an important milestone in Seiko's 1981 lineup. It features a White dial protected by a Acrylic crystal and offers 50m of water resistance. [seikata-wm-ade76e9a19e6]

Also known as: Panda

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

White

Jewels

33j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1981

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