Seiko Cal. 4540 - 284

The Seiko 4540-284 represents an important milestone in Seiko's 1974 lineup. It features a Black dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-c9bbf1e97e49]

Also known as: Helmet, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

10.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

50m

Dial Color

Black

Jewels

21j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1974

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