Seiko Cal. 4536 - 185

The Seiko 4536-185 represents an important milestone in Seiko's 1968 lineup. The Inner Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-b21a16bd91cb]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

9.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

24j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1968

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