Seiko Cal. 3820 - 521

The 3820-521 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3820 caliber with 30j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-302fc54e58d1]

Also known as: Shogun, Bullhead

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

White

Jewels

30j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1966

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