Seiko Cal. 4450 - 418

Released in 1970, the Cal. 4450 with design code 418 was part of Seiko's domestic market collection. With its 20mm lug width and 8.7mm profile, it sits comfortably on most wrists. [seikata-wm-275cb372afb7]

Also known as: Sumo, Helmet

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

40mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1970

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