Seiko Cal. 4439 - 728

This Hand-Winding model from 1970 features a 46mm Hardlex-Coated Steel case. With its 22mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-00230bfcbc48]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

22j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1970

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