Seiko Cal. 4531 - 518

This Hand-Winding model from 1971 features a 39mm Two-Tone case. Powered by the 4531 caliber with 25j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-ee471fa045c9]

Also known as: Monster, Rally

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Champagne

Jewels

25j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1971

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