Seiko Cal. 3856 - 820

The Seiko 3856-820 represents an important milestone in Seiko's 1972 lineup. With its 22mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-b687fde89ac1]

Also known as: Sumo, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

13.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

White

Jewels

30j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1972

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