Seiko Cal. 6637 - 420

The Seiko 6637-420 represents an important milestone in Seiko's 1995 lineup. It features a Navy dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-346cc4891185]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

45mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Navy

Jewels

21j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1995

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