Seiko Cal. 5637 - 664

The 5637-664 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Green dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-73ae0aab2dc8]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

8.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

25j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1980

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