Seiko Cal. 5678 - 637

The 5678-637 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5678 caliber with 20j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-78d9a4b6f8b0]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

11.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1989

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