Seiko Cal. 4540 - 762

This Spring Drive model from 1984 features a 40mm Stainless Steel case. It features a Black dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-9122257ebfc1]

Also known as: World Timer, Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

8.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1984

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