Seiko Cal. 4478 - 545

The Seiko 4478-545 represents an important milestone in Seiko's 1975 lineup. Powered by the 4478 caliber with 30j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-a86435bf5963]

Also known as: Sumo, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

9.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Green

Jewels

30j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1975

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