Seiko Cal. 3891 - 710

The Seiko 3891-710 represents an important milestone in Seiko's 1971 lineup. Powered by the 3891 caliber with 30j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-240baff43d57]

Also known as: Navigator

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Green

Jewels

30j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1971

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