Seiko Cal. 7156 - 304

The Seiko 7156-304 represents an important milestone in Seiko's 1971 lineup. Powered by the 7156 caliber with 30j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-2ad4b7a05f14]

Also known as: Monster, Sportsmatic

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

45mm

Case Thickness

10.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

80m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1971

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