Seiko Cal. 4520 - 257

The Seiko 4520-257 represents an important milestone in Seiko's 1971 lineup. The Bidirectional bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-7033ab60a8b8]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

15.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Burgundy

Jewels

17j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1971

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