Seiko Cal. 4442 - 639

The Seiko 4442-639 represents an important milestone in Seiko's 1971 lineup. With its 21mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-04f56d67fe0e]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

120m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1971

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