Seiko Cal. 5691 - 668

Seiko 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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