Seiko Cal. 3821 - 991

This Spring Drive model from 1969 features a 41mm Hardlex-Coated Steel case. Powered by the 3821 caliber with 33j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-04d0748d73ba]

Also known as: Crown, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

11.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

180m

Dial Color

Cream

Jewels

33j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1969

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