Seiko Cal. 5637 - 503

The 5637-503 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5637 caliber with 35j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-a0e85b90fd11]

Also known as: Monster, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

35j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1989

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