Seiko Cal. 5638 - 645

The 5638-645 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5638 caliber with 26j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-368fcda9754b]

Also known as: Pogue, Silverwave

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

14.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

White

Jewels

26j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1985

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