Seiko Cal. 5646 - 618

The Seiko 5646-618 represents an important milestone in Seiko's 1966 lineup. It features a Black dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-504a76d3b96d]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

46mm

Case Thickness

15.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Black

Jewels

32j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1966

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