Seiko Cal. 6178 - 420

The Seiko 6178-420 represents an important milestone in Seiko's 1973 lineup. The Inner Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-a7bd21dc7d7a]

Also known as: Sumo, Arnie

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Navy

Jewels

36j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1973

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