Seiko Cal. 4520 - 399

The Seiko 4520-399 represents an important milestone in Seiko's 1971 lineup. Powered by the 4520 caliber with 34j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-e7ffea2fb150]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

38mm

Case Thickness

10.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Silver

Jewels

34j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1971

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