Seiko Cal. 4438 - 646

The Seiko 4438-646 represents an important milestone in Seiko's 1978 lineup. With its 20mm lug width and 8.7mm profile, it sits comfortably on most wrists. [seikata-wm-420b6ba24830]

Also known as: Golden Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

37mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Navy

Jewels

35j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1978

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