Seiko Cal. 4440 - 840

The 4440-840 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-88e1b9f0efb0]

Also known as: Sumo, Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

8.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Black

Jewels

30j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1997

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