Seiko Cal. 5637 - 287

The Seiko 5637-287 represents an important milestone in Seiko's 1973 lineup. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-4450b96128b2]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

9.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

White

Jewels

21j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1973

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