Seiko Cal. 3820 - 635

The 3820-635 is a sought-after Spring Drive piece from Seiko's golden era. The Coin-Edge bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-28ffe7b2708f]

Also known as: Bullhead, Emperor

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

8.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1978

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