Seiko Cal. 3821 - 631

The Seiko 3821-631 represents an important milestone in Seiko's 1965 lineup. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-b8b50dd0db98]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

40mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

190m

Dial Color

Cream

Jewels

23j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1965

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