Seiko Cal. 5638 - 745

The 5638-745 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5638 caliber with 31j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-261274f3fef7]

Also known as: Monster, Shogun

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

10.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Cream

Jewels

31j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1994

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