Seiko Cal. 6638 - 504

The 6638-504 is a sought-after Spring Drive piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 190m of water resistance. [seikata-wm-f957d40411d8]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

35mm

Case Thickness

12.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1991

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