Seiko Cal. 3840 - 677

The Seiko 3840-677 represents an important milestone in Seiko's 1980 lineup. Powered by the 3840 caliber with 20j jewels beating at 21,600 bph, it delivers a 62 hours power reserve. [seikata-wm-3fd780e59122]

Also known as: Sportsmatic, Navigator

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

45mm

Case Thickness

14.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

20j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1980

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