Seiko Cal. 5637 - 158

The 5637-158 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5637 caliber with 30j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-5e150a3b7c57]

Also known as: Sportsmatic, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

11.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Black

Jewels

30j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1987

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