Seiko Cal. 6638 - 503

The 6638-503 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 13.3mm profile, it sits comfortably on most wrists. [seikata-wm-47bd469bdcda]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

13.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Black

Jewels

19j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1995

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