Seiko Cal. 5618 - 491

The 5618-491 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5618 caliber with 23j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-3016cd0ab9de]

Also known as: Shogun, Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

13.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1977

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