Seiko Cal. 5681 - 545

The Seiko 5681-545 represents an important milestone in Seiko's 1966 lineup. Powered by the 5681 caliber with 22j jewels beating at 36,000 bph, it delivers a 65 hours power reserve. [seikata-wm-31781e827da7]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

9.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

120m

Dial Color

Black

Jewels

22j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1966

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