Seiko Cal. 5691 - 668

The 5691-668 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5691 caliber with 25j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-86c7ce64d3d1]

Also known as: Turtle, UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

8.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1996

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