Seiko Cal. 4531 - 506

This Spring Drive model from 1970 features a 41mm Gold-Plated case. Powered by the 4531 caliber with 30j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-dc5eb7ebf082]

Also known as: Samurai, Bullhead

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

9.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Navy

Jewels

30j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1970

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