Seiko Cal. 6637 - 548

The 6637-548 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-e80c01cc90d6]

Also known as: UFO, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Navy

Jewels

22j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1992

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