Seiko Cal. 3861 - 816

This Spring Drive model from 1971 features a 40mm Hardlex-Coated Steel case. Powered by the 3861 caliber with 21j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-5014ba5f9a34]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1971

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