Seiko Cal. 3820 - 942

The Seiko 3820-942 represents an important milestone in Seiko's 1970 lineup. Powered by the 3820 caliber with 30j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-07b89c529959]

Also known as: Tuna, Helmet

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

15.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1970

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