Seiko Cal. 3840 - 128

The Seiko 3840-128 represents an important milestone in Seiko's 1970 lineup. Powered by the 3840 caliber with 26j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-d6cfa96810a6]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

39mm

Case Thickness

8.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1970

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