Seiko Cal. 6399 - 352

This Spring Drive model from 1977 features a 37mm Hardlex-Coated Steel case. Powered by the 6399 caliber with 32j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-3b3848ba9cac]

Also known as: World Timer, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

13.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

130m

Dial Color

Black

Jewels

32j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1977

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