Seiko Cal. 3878 - 735

The Seiko 3878-735 represents an important milestone in Seiko's 1976 lineup. The Inner Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-5ebd4773bd2e]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

8.3mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Cream

Jewels

32j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1976

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