Seiko Cal. 3840 - 712

The Seiko 3840-712 represents an important milestone in Seiko's 1976 lineup. Powered by the 3840 caliber with 36j jewels beating at 28,800 bph, it delivers a 70 hours power reserve. [seikata-wm-682bb8a641e9]

Also known as: Tuna, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

35mm

Case Thickness

10.0mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

36j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1976

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