Seiko Cal. 5661 - 316

The Seiko 5661-316 represents an important milestone in Seiko's 1968 lineup. The Inner Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-21ac6d1f6c99]

Also known as: Bellmatic, Emperor

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

34mm

Case Thickness

13.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

22j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1968

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