Seiko Cal. 4540 - 657

This Spring Drive model from 1975 features a 46mm Stainless Steel case. It features a Black dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-b6c7d8e7b340]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

14.3mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1975

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