Seiko Cal. 5631 - 157

The 5631-157 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Green dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-7124f09df941]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

10.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Green

Jewels

33j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1976

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