Seiko Cal. 5637 - 803

The Seiko 5637-803 represents an important milestone in Seiko's 1971 lineup. Powered by the 5637 caliber with 21j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-7fda26832604]

Also known as: Golden Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

38mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

150m

Dial Color

Silver

Jewels

21j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1971

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