Seiko Cal. 5638 - 271

The 5638-271 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5638 caliber with 21j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-8ca73622eed6]

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

13.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Burgundy

Jewels

21j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1994

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