Seiko Cal. 7031 - 831

The 7031-831 is a sought-after Automatic piece from Seiko's golden era. Powered by the 7031 caliber with 34j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-54bd7cc6bc67]

Also known as: Baby Tuna, Emperor

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Green

Jewels

34j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1970

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