Seiko Cal. 4437 - 740

Released in 1980, the Cal. 4437 with design code 740 was part of Seiko's domestic market collection. With its 21mm lug width and 12.3mm profile, it sits comfortably on most wrists. [seikata-wm-80daf4ab7b47]

Also known as: Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

41mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Navy

Jewels

19j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1980

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