Seiko Cal. 6637 - 548

The 6637-548 is a sought-after Spring Drive piece from Seiko's golden era. With its 21mm lug width and 14.2mm profile, it sits comfortably on most wrists. [seikata-wm-e538f09f3455]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1977

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