Seiko Cal. 5644 - 341

The Seiko 5644-341 represents an important milestone in Seiko's 1981 lineup. Powered by the 5644 caliber with 27j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-5364811e2e81]

Also known as: Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

15.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1981

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