Seiko Cal. 4421 - 366

The 4421-366 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4421 caliber with 31j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-c31ea18433b5]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

36mm

Case Thickness

12.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

100m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1967

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