Seiko Cal. 3820 - 997

The 3820-997 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3820 caliber with 35j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-2e1a1d06778b]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

11.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Navy

Jewels

35j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1979

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