Seiko Cal. 5668 - 440

The 5668-440 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5668 caliber with 22j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-d73c36cc2ebe]

Also known as: Tuna, Navigator

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

9.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Green

Jewels

22j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1977

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