Seiko Cal. 4420 - 640

The 4420-640 is a sought-after Solar piece from Seiko's golden era. With its 20mm lug width and 11.0mm profile, it sits comfortably on most wrists. [seikata-wm-58a3b14db5be]

Also known as: Shogun

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

11.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

110m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1970

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