Seiko Cal. 6639 - 402

The Seiko 6639-402 represents an important milestone in Seiko's 1987 lineup. It features a Green dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-04920d098d6d]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

41mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

50m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1987

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