Seiko Cal. 4436 - 425

The 4436-425 is a sought-after Hand-Winding piece from Seiko's golden era. With its 21mm lug width and 10.6mm profile, it sits comfortably on most wrists. [seikata-wm-20b9bd061dfa]

Also known as: Tuna, Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Cream

Jewels

19j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1989

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