Seiko Cal. 4520 - 377

This Spring Drive model from 1991 features a 39mm Hardlex-Coated Steel case. Powered by the 4520 caliber with 36j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-1c9d31036f56]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

140m

Dial Color

Cream

Jewels

36j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1991

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