Seiko Cal. 7031 - 638

This Automatic model from 1970 features a 41mm Stainless Steel case. Powered by the 7031 caliber with 30j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-9f8e8b376f4a]

Also known as: Bullhead, UFO

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

11.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

White

Jewels

30j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1970

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