Seiko Cal. 4540 - 366

The Seiko 4540-366 represents an important milestone in Seiko's 1993 lineup. With its 20mm lug width and 8.1mm profile, it sits comfortably on most wrists. [seikata-wm-e2d52fb4bc0f]

Also known as: Bullhead, Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

8.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Green

Jewels

19j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1993

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