Seiko Cal. 4531 - 437

The 4531-437 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4531 caliber with 20j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-998822adbf35]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

43mm

Case Thickness

13.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

20j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1985

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