Seiko Cal. 4437 - 662

The 4437-662 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4437 caliber with 27j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-d17bfe168fdd]

Also known as: Sumo, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

14.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1983

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