Seiko Cal. 5637 - 904

The Seiko 5637-904 represents an important milestone in Seiko's 1971 lineup. With its 21mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-5c2ee43f2e6e]

Also known as: UFO

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

34mm

Case Thickness

11.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1971

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