Seiko Cal. 5616 - 931

This Hand-Winding model from 1966 features a 41mm Titanium case. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-ed5f0448d5d6]

Also known as: Helmet, Emperor

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

41mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1966

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