Seiko Cal. 5637 - 804

The 5637-804 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5637 caliber with 18j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-296a887699a3]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Black

Jewels

18j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1980

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