Seiko Cal. 4437 - 591

Released in 1966, the Cal. 4437 with design code 591 was part of Seiko's domestic market collection. Powered by the 4437 caliber with 34j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-998a6bf275be]

Also known as: Emperor

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

11.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Cream

Jewels

34j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1966

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