Seiko Cal. 4478 - 637

The Seiko 4478-637 represents an important milestone in Seiko's 1989 lineup. It features a Silver dial protected by a Hardlex crystal and offers 180m of water resistance. [seikata-wm-68fb0a4a90ce]

Also known as: Golden Tuna, Arnie

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

10.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Silver

Jewels

25j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1989

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