Seiko Cal. 5637 - 307

The Seiko 5637-307 represents an important milestone in Seiko's 1970 lineup. Powered by the 5637 caliber with 23j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-e9417c61bb42]

Also known as: Rally

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

38mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1970

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