Seiko Cal. 7172 - 391

The Seiko 7172-391 represents an important milestone in Seiko's 1969 lineup. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-08e37f8f16cb]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1969

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