Seiko Cal. 4438 - 643

Released in 1971, the Cal. 4438 with design code 643 was part of Seiko's domestic market collection. With its 22mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-1c7af3ea030a]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

9.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1971

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