Seiko Cal. 4428 - 406

The 4428-406 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4428 caliber with 20j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-936cae41a3ce]

Also known as: Monster, Shogun

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

35mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1974

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