Seiko Cal. 6121 - 939

The Seiko 6121-939 represents an important milestone in Seiko's 1978 lineup. Powered by the 6121 caliber with 17j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-d138ddec1cfc]

Also known as: Bullhead, Navigator

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

10.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1978

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