Seiko Cal. 5681 - 645

The Seiko 5681-645 represents an important milestone in Seiko's 1967 lineup. It features a Black dial protected by a Mineral crystal and offers 190m of water resistance. [seikata-wm-b594b60dd1b3]

Also known as: Baby Tuna, Flighty

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

11.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1967

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