Seiko Cal. 3820 - 766

The 3820-766 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3820 caliber with 31j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-ee59342bcd09]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

8.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

130m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1974

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