Seiko Cal. 4478 - 485

The Seiko 4478-485 represents an important milestone in Seiko's 1966 lineup. Powered by the 4478 caliber with 20j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-b1d105ce62d8]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

14.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

White

Jewels

20j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1966

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