Seiko Cal. 3840 - 328

The Seiko 3840-328 represents an important milestone in Seiko's 1991 lineup. Powered by the 3840 caliber with 31j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-e8229f1de4d9]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

40mm

Case Thickness

11.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Cream

Jewels

31j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1991

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